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Basic Operations............................................................ 18

 

3.1 Making a Call.......................................................................... 18

 

3.2 Answering a Call..................................................................... 20

 

3.2.1 Handset Auto Answer ...................................................... 20

 

3.2.2 Setting Any Key Answer ................................................. 20

 

3.2.4 Incoming Call Silence ..................................................... 21

 

3.3 In Conversation ....................................................................... 21

 

3.3.1 Silence in Conversation ................................................... 21

 

3.3.2 Adjusting Volume in Conversation .................................. 21

 

3.3.3 Selecting Options in Conversation .................................. 21

 

3.4 Menu Functions ...................................................................... 22

 

4

 

Names ............................................................................. 23

 

4.1 Viewing Records ..................................................................... 23

 

4.2 Finding Records ...................................................................... 23

 

4.3 Adding New Entry .................................................................. 24

 

4.4 Editing Contacts of Names...................................................... 26

 

4.5 Delete a Records ..................................................................... 26

 

4.6 Delete All Records .................................................................. 26

 

4.7 Selecting Group ...................................................................... 27

 

4.8 Setting Speed Dial................................................................... 27

 

4.9 Viewing and Making Speed Dial............................................. 28

 

4.10 Capacity ................................................................................ 28

 

4.11 Batch Operation .................................................................... 29

 

Summary of Contents for C350

Page 1: ...C350 CDMA 1X Digital Mobile Phone User Manual ...

Page 2: ...m or by any means electronic or mechanical including photocopying and microfilm without the prior written permission of ZTE Corporation The manual is published by ZTE Corporation We reserve the right to make modifications on print errors or update specifications without prior notice Version Release 1 0 Date June 2007 Manual number 056584500373 ...

Page 3: ...cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Do not attempt to disassemble the mobile phone and battery by yourself Non expert handling of the devices may damage them Your wireless phone is a radio transmitter and receiver It is designed and manufactured not to exceed limits for exposure to radio freque...

Page 4: ...ual SAR level of the phone while operating can be well below the maximum value This is because the phone is designed to operate at multiple power levels so as to use only the power required to reach the network In general the closer you are to a wireless base station the lower the output power The Highest SAR Values for this model phone when tested for use on the Right cheek were 1 15mW g Some ele...

Page 5: ...erference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receivi...

Page 6: ...Phone 8 2 1 Keypad 8 2 2 Instruction of Interface Icon 11 2 3 Technical Parameters 12 2 4 Battery 12 2 4 1 Remove and Installation of Battery 12 2 4 2 Charging the Battery 13 2 5 Connecting to the Network 15 2 5 1 UIM Card 15 2 5 2 Insertion and Extraction of UIM Card 15 2 5 3 Power on off Phone 16 2 5 4 PIN Code 16 2 5 5 Connecting the Network 17 ...

Page 7: ...rsation 21 3 3 2 Adjusting Volume in Conversation 21 3 3 3 Selecting Options in Conversation 21 3 4 Menu Functions 22 4 Names 23 4 1 Viewing Records 23 4 2 Finding Records 23 4 3 Adding New Entry 24 4 4 Editing Contacts of Names 26 4 5 Delete a Records 26 4 6 Delete All Records 26 4 7 Selecting Group 27 4 8 Setting Speed Dial 27 4 9 Viewing and Making Speed Dial 28 4 10 Capacity 28 4 11 Batch Oper...

Page 8: ...ages 34 5 6 Reading and Setting Voice Mail 34 5 6 1 Reading Voice Mail 34 5 6 2 Set Voice Mail Number 34 5 7 Message Settings 35 5 7 1 Save Position 35 5 7 2 Auto Save 35 5 7 3 Automatically Erasing Inbox 35 5 7 4 Set Proformatted message 35 5 7 5 Messages Alert 36 5 7 6 Delivery Acknowledging 36 5 7 7 Msg Priority 36 5 7 8 Memory Status 36 6 Call History 38 6 1 Viewing Recent Calls 38 6 2 Erasing...

Page 9: ...pe 41 7 1 6 Key Beep 42 7 2 Display 42 7 2 1 Wall Paper Set 42 7 2 2 Set Backlighting 42 7 2 3 Set Brightness 43 7 2 4 Set Contrast 43 7 2 5 Set Language 43 7 2 6 Setting Time Format 43 7 2 7 Changing Banner 43 7 3 Call Settings 44 7 3 1 Setting Headset Autoanswer 44 7 3 2 Setting Any Key Answer 44 7 3 3 Voice Privacy 44 7 3 4 Alert 45 7 3 5 Supp Services 45 ...

Page 10: ...etting 49 8 Toolkit 50 8 1 Calendar 50 8 2 Alarm Clock 50 8 3 Calculator 51 8 4 Voice Memo 52 8 4 1 Recording in Normal 52 8 4 2 Recording in Conversation 52 8 4 3 Recording with Incoming Call Message 53 8 5 Games 53 8 6 Stopwatch 54 9 VAS 55 10 Text Input 56 10 1 Multitap Input 57 10 2 Numbers Input 57 10 3 eHiText Input 57 10 4 Symbols Input 58 ...

Page 11: ...vi 11 Troubleshooting 59 ...

Page 12: ...rd If your phone could be used without UIM card please pay attention to the following items 1 You can use your phone without inserting the UIM card 2 Some functions are only available with UIM and won t display such as You can save the new contact only in Phone not in UIM You can save the new message only in Phone not in UIM The message in Inbox can not be moved to UIM There is no PIN Lock functio...

Page 13: ...es a policy of continuous development and reserves the right to update and modify the technical specifications in this document at any time without prior notice 1 2 Security If your mobile phone is lost or stolen please report to your service provider or agencies of banning the use of your lost UIM card and phone which will protect you from economic losses resulted from unauthorized use You need t...

Page 14: ... keep the mobile phone more than 20 centimeters away from such medical devices when the phone is powered on Do not carry the mobile phone in the breast pocket Power the mobile phone off if necessary Consult a physician or the manufacturer on the medical device before using the phone Be aware of the usage limitation when using a mobile phone at places such as oil warehouses or chemical factories wh...

Page 15: ...abric that is a bit wet or anti static Do not use harsh chemical cleaning solvents or strong detergents to clean it Turn off your phone before you clean it As your mobile phone can produce electromagnetic field do not place it near magnetic items such as computer disks Using the phone near electrical appliances such as TV telephone radio and personal computer can cause interference which affects t...

Page 16: ...ndby press the key to enter emergency phone number and then press Send key to make a phone call Battery Using Do not short circuit the battery as this can cause excessive heat and fire Do not store battery in hot areas or dispose of it in a fire to avoid explosion Never use any charger or battery damaged or worn out Return the wear out battery to the provider or put it in the appointed recycle pla...

Page 17: ...o the place where duplex wireless equipments are banned Don t put your phone together with flammable or explosive items as inner spark may cause fire In Aircraft Follow the restrictions in aircraft Wireless devices can cause interference in aircraft Please power off your mobile phone before taking off till landing In order to protect airplane s communication system from interference it is never al...

Page 18: ...oducts End User shall have no right to reject return or receive a refund for any product from ZTE under the above mentioned situations This warranty is end user s sole remedy and ZTE s sole liability for defective or nonconforming items and is in lieu of all other warranties expressed implied or statutory including but not limited to the implied warranties of merchantability and fitness for a part...

Page 19: ...7 in connection with using this product whether or not ZTE had been advised knew or should have known the possibility of such damages ...

Page 20: ...Send key Make or answer a call Press Send key in standby mode to enter all Records list Press Send key two times directly Earpiece Left Select Key Right Select Key LCD Screen Send Key Charger Earphone connector End Key 0 9 Number Key Microphone 4 Way scroll key ...

Page 21: ...menu Right select key Enter Names in standby mode Switch to the options of right bottom submenu OK key Confirm the commands and options selected Confirm the character chosen while character inputting Enter MobileShop menu in standby mode Up Down key Scroll key Scroll the cursor up and down Used as selection key up and down for keying in commands and selecting options shown on the display In standb...

Page 22: ...ursor left and right for keying in commands and selecting options shown on the display In standby mode press Left key to enter Toolkit press Right key to enter Games menu Adjust volume in conversation Used as direction key in games 0 9 Number key Key in numbers or characters Make a Speed Dial call Hold 0 Key to input in standby mode key key key Press key to select text input mode key Hold key in s...

Page 23: ...ss the key in this manual means to press the key and release it To hold the key means to keep pressing the key for two seconds or more 2 2 Instruction of Interface Icon Icon Indication Signal strength Roaming New voice message New message New urgent message Ringer with vibration Vibration Earphone Silence All Alarm Power indicator ...

Page 24: ...other relative parameters of the battery and charger 2 4 Battery The attached Li ion battery along with the phone can be used after unpacking For the first three times please use up the power and charge it fully for a new battery to perform well 2 4 1 Remove and Installation of Battery Remove 1 Press and push the back cover of the phone down to release and remove it off the phone 2 Put finger on t...

Page 25: ... the phone flatly upon the body of phone Direct the back cover towards the locking catches on the both sides of the phone and push the back cover of the phone upward to lock the cover into its place 2 4 2 Charging the Battery Plug out rubber away turn 180 as shown in the picture from the jack on the bottom of the handset and connect the lead from ...

Page 26: ... the charging indicator on the screen stops flopping the charging is completed The charging takes usually up to 2 3 hours In the process of charging it is a normal phenomenon that the battery phone and charger get into hot accordingly After the completion of charging disconnect the charger from the phone and AC socket Note When it is in charge place the phone on condition of good ventilation and t...

Page 27: ...ith the information you stored in your Contacts in the UIM card The UIM card can be inserted into any CDMA phone to use new phone automatically reads UIM card Please do not touch the metal plane area of the card to avoid missing and damaging information in the card and put UIM card in place far away from electricity and magnetism Warning Please power off the phone before taking out UIM card It is ...

Page 28: ...earching Search appropriate network connected 2 5 4 PIN Code To set PIN code personal identification number is to avoid the illegal usage of UIM card To input PIN code of UIM card and press OK key to confirm to start on using phone If inputting wrong PIN three times continuously UIM card will be locked by network Note The network provider offers you PIN code four to eight digits You should change ...

Page 29: ...ceiving calls you can also do Press Left select key to enter Main menu Press Right select key to enter Names menu Hold key to enable disable vibration mode Hold Up key to set the phone in Silence All Press Up key to enter Messages menu Press Left key to enter Toolkit menu Press Right key to enter Games manu Press Send key to enter All Calls list Press OK Key to enter MobileShop ...

Page 30: ...ntensity of receiving signal is better Sometimes you only need to change the direction Making a National Call Press Number key to key in phone number and add area code when making a long distance call no need to add area code when dialing local number in some area Press Send key to call out Press End key to end the call and conversation Making an International Call Enter the country code area code...

Page 31: ... be erased automatically when new record is coming You can check the list as follows In standby mode press Send key to view All Recent Calls The number listed in can be directly dialed by pressing Send key Making Pause Calls You can make use of pause call to dial an extention or voice service call E g Key in phone number press OK key to select P on the display character P added accordingly and the...

Page 32: ...call and the call duration is temporarily displayed See 7 3 Call Setting or refer to other ways of answering calls for your option as follows 3 2 1 Handset Auto Answer You can set handset to answer an incoming call automaticlly Select Menu Settings Call Setting Auto Answer Select On Off and press OK key The phone can be connected in 5 seconds 3 2 2 Setting Any Key Answer Select Menu Settings Call ...

Page 33: ...elect Mute to let the other party temporarily not hear your voice Select Unmute back to normal You can also enter Contacts Messages or Record during a conversation 3 3 2 Adjusting Volume in Conversation Press Left Right key to adjust volume of Earpiece during a call 3 3 3 Selecting Options in Conversation During a call press Left Right select key to select options of Option Names Messages or recor...

Page 34: ...submenu you want according to the prompt on the screen iii Press OK key or Right Select Key to set or return to the previous menu Press End key to exit to standby mode Bottom Menu Function If options are displayed on the bottom of the screen press Left Right select key to select Press OK key or Right select key to set or exit The functions of phone are mainly grouped in main Menu Names Messages Ca...

Page 35: ...ect Option Other options Capacity to view memory of phone and UIM card 4 1 Viewing Records Select Menu Names You can view the corresponding records in all list Scroll to the name you are finding and press OK Key you can see the details of the name Note When there is no storage record in Contacts it will indicate No Item 4 2 Finding Records You can search for a name in Names in pop up window by cho...

Page 36: ...scroll though the corresponding name s and records in the list Scroll to the name you want and press OK key to view the details or select Option In Standby Mode To quickly find phone number in Names in standby mode press Right select key to scroll to the name you want All the contacts will be list by the letter of the name If no contact in the list No Item will be displayed 4 3 Adding New Entry 1 ...

Page 37: ...Option Further operation can be executed such as Edit Edit the number Delete Delete the number Make a call Make a call to this number Send Message Send message to this number Copy to Phone UIM Copy the contact to Phone UIM Move to Phone UIM Move the contact to Phone UIM Set Speed Dial Assign a speed dial number to the phone number When the contacts saved in UIM there is no this function Note In st...

Page 38: ... select key to erase character of the current and rewrite the new 6 Select Save Succeed to save appears on the display 4 5 Delete a Records 1 Select Menu Names 2 Scroll to the record you want to erase or Search in Option to search for would be erased record 3 Select Option to delete contact and press OK key Confirm to delete indicated on the display 4 Press OK key to make delete 4 6 Delete All Rec...

Page 39: ...ague Further operation can be executed such as Edit Group Name prees OK and you can rename the name of group Select Ringer Set the personal ringer for the group You can select ring from the list set already in phone or download ring by yourself 4 8 Setting Speed Dial 1 Select Menu Names 2 Select one contact record listed in phone s memory press OK key or choose View details in Option 3 Scroll to t...

Page 40: ... one digit directly hold the digit key If the Speed Dial Number is two digit press first digit key and then hold the second one For example If the Speed Dial Number is 25 you should press 2 key firstly and then hold 5 key thus it can dial directly Note Some handset may not support method 1 Some handset support only one digit speed dial number some support both one digit and two digit speed dial nu...

Page 41: ...ct in between phone s memory or SIM card Copy Phone To UIM Copy all contacts of the phone s memory to UIM card Note This function can copy all the contact records to UIM card and all the different records or numbers under the same name will be copied accordingly to UIM card one by one as different records Copy UIM To Phone Copy all contacts in UIM card to the phone memory Note This function can co...

Page 42: ...e same name will be copied accordingly to UIM card one by one as different records Move UIM To Phone Copy all contacts in UIM card to the phone memory Note This function can copy all the contact records to the phone s memory and all the different records with same name will be copied accordingly to the phone s memory ...

Page 43: ...ease consult with the service provider to support the network service of sending message You can only send message to the mobile phone which can receive message 1 Select Menu Messages New SMS 2 Write message text See 10 Text Input more instructions for writing text and character 3 Press OK key Left Select key to Send message Send message Save Save the message in OutBox 4 Input the recipients Phone...

Page 44: ...iving the call you can continue to edit and send the message 5 3 Reading Message On receipt of a new message the phone prompts you by vibration or ringer up to silence and ringer in Settings The display indicates MESSAGE and press OK key to View Erase old messages to keep space for new messages 1 Select Menu Messages Inbox 2 Scroll to the message you want to read 3 Press OK key to read message You...

Page 45: ... to return to the list Select OK Key to Forward Delete Send the message 5 5 Erasing Messages Delete and erase old messages to release space for phone s SMS memory You can select erasing messages when sending or reading messages erase messages one by one or all in Inbox Outbox 5 5 1 Deleteing a Message 1 Select Menu Messages 2 Select messages location Inbox Outbox 3 Press Up down key to select to b...

Page 46: ... using Voice Mailbox please consult with network provider to confirm that the function of voice mail box has been activated After your successful setting network will automatically transfer divert incoming call s to your voice mail box and send message s to your phone Select Menu Message Voice mail Call Voicemail to dial voice mail box number to listen to the leaving message following guide prompt...

Page 47: ...an not automatically save senting message 5 7 3 Automatically Erasing Inbox Set erasing the last read message in Inbox automatically when Inbox is full 1 Select Menu Messages Msg Settings Auto Delete 2 Select On or Off and press OK key Left select key 5 7 4 Set Proformatted message The phone has a group of some common built in phrases and sentences such as Please call me immediately I am busy now ...

Page 48: ...nu Messages Msg Settings Delivery Ack 2 Select On or Off for your phone can or can not automatically receive message from network informing you whether you have sent message successfully 5 7 7 Msg Priority 1 Select Menu Messages Msg Settings Msg Priority 2 Select Normal Interactive Urgent Emergency for sending message 5 7 8 Memory Status Select Menu Messages Msg Settings Memory Status View the num...

Page 49: ...37 Max out of which 8 have be saved in phone UIM 4 100 And 100 entries in Max out of which 4 have been saved in UIM Card Please consult with service supplier for storage capacity of UIM card ...

Page 50: ...l History 2 Select All Calls Missed Calls Received Calls Dialed Calls 3 Press OK key 4 Select one entry of the records and press OK key 5 Select option Call Information Indicate number and conversation duration informations Save Save the number in mobile phone s Names Delete Delete the number from the list of Call History Clear all Delete all numbers from the list of All Calls Received Calls Diale...

Page 51: ...lear all 2 Press OK key to delete all the numbers from the list of Call History 6 3 Call Timers Your phone can record the talk time of dialing and receiving call 1 Select Menu Call History Call timers 2 Select an option from the list and press OK Key Outgoing Calls Indicate the talk time of all dialed call The timer can be reset Incoming Calls Indicate the talk time of all received call The timer ...

Page 52: ...u Settings Sound Volume 2 Select Ringer Volume When earphone is inserted it is earphone Ringer Earpiece Volume or Key Beep Volume 3 Press Left Right key to adjust volume Press OK key 7 1 2 Ring of Incoming Call ZTEC350 offers various Ringers of incoming call for your selection 1 Select Menu Settings Sound Ring Ring Type 2 Press Up Down key to scroll to your selection in Preset Ring DownLoad Ring o...

Page 53: ...set the phone in Silence or ring when you power on off the phone 7 1 5 Alert Type You can select alert type for an incoming call earpiece and message 1 Select Menu Setting Sound Alert type 2 Select an option in list Vibra Ringer Set mobile phone in ten second vibration case then continuous Ringer later to prompt incoming call Ringer Set Mobile phone in Ringer case to prompt Vibrate Set mobile phon...

Page 54: ...r when press keys 7 2 Display 7 2 1 Wall Paper Set You can select different wall papers as background in idle state 1 Select Menu Settings Display Wall Paper 2 Press Up Down Key to select Preset Wallpaper or Download Wallpaper 3 Press Up Down Key to scroll the list and press OK key Left Select Key to confirm 7 2 2 Set Backlighting During a call or pressing keys the display lights on You can set li...

Page 55: ... 1 Select Menu Settings Display Brightness 2 Press Left Right key to adjust brightness and press OK 7 2 4 Set Contrast 1 Select Menu Settings Display Contrast 2 Press Left Right key to adjust contrast and press OK 7 2 5 Set Language 1 Select Menu Settings Display Language 2 Select English as the language and press OK key 7 2 6 Setting Time Format 1 Select Menu Settings Display Time Format 2 Select...

Page 56: ...o answer automatically incoming call 1 Select Menu Settings Call Setting Auto Answer 2 Select On Off to activate or deactivate automatic answering 3 Press Left select key or OK key 7 3 2 Setting Any Key Answer Select Menu Settings Call Setting One Touch Select On Off and press OK key An incoming call can be answered by pressing any key except End key Left Right select key 7 3 3 Voice Privacy 1 Sel...

Page 57: ... handoff between service areas or states occurs alert For the function mentioned above select On to operate select Off to cancel alert 7 3 5 Supp Services When network supports Call Setting you can use network services of call waiting and call forwarding Note All these functions are network services Please consult with network service provider to get corresponding service application Call Waiting ...

Page 58: ...ion Call Forwarding Use Call Forwarding to forward the incoming call to a designated phone number After setting of call forwarding phone will automatically dial network to set the function in active 1 Select Menu Settings Call Setting Supp Services Call Forwarding 2 Set type of Call Forwarding press OK key All All is diverted Immediately in all conditions Busy Divert when busy When the phone is bu...

Page 59: ...List 2 Press OK key and select options Add Add new contact in Friend List Edit Edit this contact in Friend List Delete Delete this contact in Friend List Clear all Delete all the contacts in Friend List If there is no contact in the list List Empty will be displayed Black List All the contacts will be listed by the letter of the name 1 Select Menu Settings Call Settings Fire Proof Black List 2 Pre...

Page 60: ...Answer Call 2 Select On or Off and press OK Key to set answer the call by open flip 7 4 Security Settings Introduction to phone s security options preventing others to avoid illegal use or acquire your phone s personal information Please input right phone Password and PIN code to enter Note Consecutive inputting wrong PIN code for several times can cause locking of UIM Card To unlock you need PUK ...

Page 61: ...3 Restore setting Your phone offers factory default phone setting You may modify some options when you use phone You can also Restore Factory Default to renew some modified options to the origin 1 Select Menu Settings Security 2 Input your phone password press OK key 3 Select Restore Settings 4 Select Ok to revert to confirm resetting or restoring factory default or select Cancel to exit Note Rest...

Page 62: ...ft Right key or Up Down key to select exact date you want to view in pop up calendar window Press OK key 3 Scroll Up Down key to select options 8 2 Alarm Clock Set alarm alert at a certain time Alarm alerts only when the phone is in power on 1 Select Menu Toolkit Alarm clock 2 Select Set alarm to set and press OK key Select Alarms List to view the settings Select Set rest day to set the date of al...

Page 63: ...nput decimal point and press key to change digit to positive number or negative Press OK key to display the result Division Sign Subtraction Sign Equal Sign Plus Sign x Multiply Sign Decimal Point Change digit to positive number or negative Press Right Select key to erase digit one by one and exit to previous window press Left Select key to erase all digits and reset press End key to exit to stand...

Page 64: ...recording Record List Play or Delete the record listed and named by date and time Back to previous pop up menu Note The record saved in normal will be listed in Settings Sound Ring Ring Type as a kind of ringer tone You can select it or not as you like as ring of the phone The record can not be deleted as if it is activated as the ringer unless you cancel the record as the ring of the phone 8 4 2 ...

Page 65: ... The record of phone will be saved automatically and return to call interface With Message While recording in state of non conversation receive a message won t stop recording The phone prompts message alert without display message interface With Others Alarm Prompts later Alert Prompts later Power off automatically while recording Save record automatically Note In state of non conversation record ...

Page 66: ...Box After the greeting phone indicates play guide You can select New Game to begin a new game or Continue for continuing the last game Make use of the Number key and Scroll key to play the game 8 6 Stopwatch 1 Select Menu Toolkit Stopwatch 2 Select Start to make stopwatch timing 3 Select Stop to stop timing 4 Select Reset to clear the time record ...

Page 67: ...der If your UIM card can also support menu of VAS appears on the display If UIM Card and network provider don t support the function is invalid The application of this function may ask for extra fee Please contact with network provider to acquire more information ...

Page 68: ...n in Names or Messages etc following the common instruction in hereinafter table Operation Method Input Letters Multitap Abc ABC Input Abc ABC press corresponding letter key till the letter appears Input Words eHiText Input eng press any key once to key in any word Input Digits Numbers Input 123 press digit key once Input Symbol Symbols Input Press key to enter the symbols mode and press correspon...

Page 69: ...and lowercase 10 1 Multitap Input Select Multitap Input Abc ABC Each key stands for multiple letters Press key till your letter appears When the cursor moves enter the next letter 10 2 Numbers Input Select Numbers Input 123 Press the corresponding key once to input the number In Numbers input mode you can not enter space 10 3 eHiText Input Select eHiText Input eng Predictive word input is based on...

Page 70: ... for another matching word Then press OK key to confirm 10 4 Symbols Input Press 1 key to input till the symbol appears Most common punctuation marks and special characters are available Or select Symbols mode by pressing key Press Up Down key to page down And press digit key to enter corresponding symbol Note in text input press key twice will enter set Idiom menu ...

Page 71: ...ease input your PIN Code which offered with UIM Card together If you have changed PIN code please input new PIN Code You can also set PIN code deactivated see 7 4 Security Settings When switching on the phone it prompts Insert card and restart phone Please check whether valid UIM card is inserted or not No key beep on pressing keys Please check the setting of Key Beep in Settings When there is an ...

Page 72: ...60 No prompt tone at alarm time Please check relative sound setting Alert Type and ringer Volume in Settings Messages cannot be sent Please check the signal of network ...

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