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E28 R2811, User Manual

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E28 R2811 User Manual Download Page 17

 17 

Software 

Operating system: Linux

 

 

Language: English/French/German/Italian/Spanish 

Input method: keypad, QWERTY soft keyboard 

Symbol Input method

：

Soft keyboard 

Digit camera: 4xdigit zoom, 2M pixels 

Contacts book: Max. 1000 contacts 

Support group and category management

：

maximum 50 groups

，

maximum 50 categories

，

 

maximum 100 contacts in one group. 

Support photo caller ID. 

Support ring tone customization: ring tone customizable by individual contact or by 

category 

Max. Length of telephone number in contacts

：

32 digits 

Max. Length of telephone number in dial pad

：

50 digit 

Ring tone mute by single key press 

Photo dialing (4groupsx9person/group) 

Auto dialed phone number recall 

Short Messages (SMS) 

–

 

Group sending

：

Max. 100 contacts 

–

 

Concatenated messages

：

10piecex140bytes/piece 

Multi-Media Messages (MMS) 

–

 

Group sending

：

Max. 100 contacts 

–

 

Support picture/ring tone /text 

–

 

Max. Pages

：

20pages 

STK 

Calendar  

Calculator 

Memo 

World clock 

E-mail 

Enable alarm clock in power-off mode 

JAVA MIDP 2.0 

Summary of Contents for R2811

Page 1: ... 1 R2811 USER MANUAL ...

Page 2: ...best but will not guarantee to eliminate this difference completely At the same time E28 reserves the rights to revise or modify the manual without prior notification or replacement with updated version The mobile phones accessories and manual may vary depending on the release areas and time The copyright of this manual is reserved by E28 Without prior written permission of E28 all or part of the ...

Page 3: ...ries randomly Do not put the battery into fire water or contact it with metal conductor to prevent explosion or short circuit Use certificated power supply and charger Use the earphone or hands free device when driving to prevent accident Comply with local rule and regulation about the usage of mobile phone strictly Note that the mobile phone may interfere with computer TV radio and other electron...

Page 4: ... encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help 1 Quick Reference 8 1 1 MOBILE OUTLINE ...

Page 5: ...ox folder 40 5 1 3 Read email 40 5 1 4 Send email 41 5 1 5 Delete email 41 5 2 MEMO 42 5 3 WORLD CLOCK 43 5 4 ALARM CLOCK 43 5 5 CALCULATOR 44 5 6 JAVA 44 6 Sight Sound 45 6 1 PHOTO CAMERA 46 6 1 1 Take photos 46 6 1 2 Review Photo 47 6 1 3 Edit Photo 48 6 2 VIDEO CAMERA 48 6 3 MP3 PLAYER 49 6 3 1 Play Music 49 6 3 2 Play list 50 6 4 GALLERY 51 6 5 PLAY VIDEO 51 7 Internet 52 7 1 STK SERVICE 54 7 ...

Page 6: ...ghtness 60 8 5 7 Backlight Auto Lock 60 8 5 8 English SC Input 61 8 5 9 Reset Factory Settings 61 8 5 10 User Information 61 8 6 WLAN VOIP SETTINGS 61 8 6 1 WLAN setting 61 8 6 2 WLAN Connect Status 61 8 6 3 VOIP setting 62 8 7 CALLS 62 8 7 1 Network 62 8 7 2 Incoming Calls 62 8 7 3 Outgoing Calls 63 8 8 MESSAGE 63 8 8 1 SMS 64 8 8 2 MMS 64 8 8 3 Cell Broadcast 64 8 8 4 Quick Message 64 8 8 5 Sign...

Page 7: ... TO TAKE PHOTOS AND SET AS A WALLPAPER 69 10 6HOW TO CHANGE THE WALLPAPER 70 10 7HOW TO SEND A MMS 70 10 8HOW TO ACCESS THE INTERNET 70 10 9HOW TO DOWNLOAD AND PLAY MP3 70 10 10 HOW TO CHANGE THE RING TONES 70 10 11 HOW TO DOWNLOAD VIDEOS AND PICTURES 70 11 Troubleshooting 71 ...

Page 8: ... this manual may be different from that of actual mobile phone Lanyard Anchor Speaker Power Screen Lock Stylus Camera Contact Delete Send WLAN Side LED Receiver GSM Side LED Display Touch Screen Menu Mirror End Home Call Log 5 way Joystick Earphone Jack Mini USB Port Message ...

Page 9: ...ctrostatic dust or water 1 3 Battery Installation 1 DO NOT remove the battery or switch the power off abnormally when the mobile phone is power on or in the charge status to prevent the mobile phone from damaging or the data from losing Power off the mobile phone before removing the battery and then take out the SIM card Take out the SIM card Power off the mobile phone before removing the battery ...

Page 10: ...10 Warning 2 DO NOT contact the battery with conductor to prevent damage from short circuit 3 DO NOT use battery which is not from original manufacturers or is not specified model ...

Page 11: ...and turn the cover of T Flash over before taking out the T Flash Don t pull out it by force Take out the T Flash card Install the T Flash card Power off the mobile phone before removing the battery and then insert the T Flash card Power off the mobile phone before removing the battery pull down and turn over the cover and then take out the T Flash ...

Page 12: ... Plug the power supply of the charger into the socket of the main power supply 3 The battery meter will flash when charging It will be normal if the charger is hot for the long charge time 4 The indicator LED will turn into yellow when the battery is full 5 Switch the power supply off before the mobile phone is disconnected from the charger 6 If the battery is discharged completely the charge indi...

Page 13: ...pply or it will shorten the life of the battery so the USB charger should be used as few as possible unless it is necessary 1 6 Idle Screen The idle screen is the start screen of the mobile from which to enter into various applications Press key in face of the mobile phone to return to the main screen in any application Status icons The state bar is at the top and bottom of the main screen of whic...

Page 14: ...pty With GSM service no GPRS service With GSM service GPRS available Roaming Call active Call on hold Mute model no ringing or vibrating Ringing mode Vibrating ringing mode Vibrating only mode Vibrating before Ringing With alert No alert WLAN service disabled ...

Page 15: ...ing 5 way joystick left 5 Directly access call log by pushing 5 way joystick right 6 Come up with dialing pad and input telephone numbers by pressing the number key Operating on pull down menu you can 1 Move up in menu item by pushing 5 way joystick upward 2 Move down in menu item by pushing 5 way joystick downward 3 Access options submenus by pressing 5 way joystick 4 Return to idle screen at any...

Page 16: ...play screen 2 2 inch 240x320 pixels TFT LCD 260 thousand colors Touch screen Camera CMOS 2 million pixels maximum 4x digit zoom Ring tone Midi MP3 Port standard Mini USB port support USB charging Size 106 5x48 5x16 5mm Weight about 100gramme include standard battery Phone factor Candy bar Antenna internal Battery capacity 1000mAH Standby time 75 130 hours Vary with network state Talking time 120 3...

Page 17: ...customization ring tone customizable by individual contact or by category Max Length of telephone number in contacts 32 digits Max Length of telephone number in dial pad 50 digit Ring tone mute by single key press Photo dialing 4groupsx9person group Auto dialed phone number recall Short Messages SMS Group sending Max 100 contacts Concatenated messages 10piecex140bytes piece Multi Media Messages MM...

Page 18: ...hour Audio playback MP3 AMR MIDI Video recording 3GP H 263 AMR QCIF Video playback 3GP H 263 AMR QCIF MP4 MPEG4 AAC QCIF MP4 MPEG4 AAC QVGA Photo style JPG full color sepia black white 240 240 320 240 480x480 640x480 1280 960 1600 1200 Picture format supported JPG GIF GIFa PNG MP3 format supported 64K 128K 192K CBR VBR Dynamic display effect 2 Telephone R2811 provides a lot of ways for dealing wit...

Page 19: ...ng tone can be set individually for each contact Contacts can be sorted by groups or categories for easy management Note Above capacity is the recommended upper limit The large capacity will affect the use performance to some extent 2 1 Telephone functions Caution You can only dial emergency call number 112 without SIM card inserted 2 1 1 Dialing R2811 provides vary of manners for dialing You can ...

Page 20: ...tion to help call the dialed number quickly When the first several digits are matched with that dialed the mobile phone will make up the rest digits automatically If the filled result is not what you want you can just continue to input the rest digits and the auto filled digits will disappear Contacts Call log Photo Dial Long click this key to insert p which followed by extension number ...

Page 21: ...put digits for example input you account or password Press to switch mute Press to hold current call need operator service Press to do third party call and conference call need operator service Press VOIP to make VOIP call Please refer to section 8 6 WLAN VOIP settings to configure your VOIP settings 4 You can also input telephone number by keypad and dial out by send key 5 Press End on screen or ...

Page 22: ...er to facilitate the contact searching there re four groups of photo dial contacts which is different in background color Each group contains 9 photo dial contacts 2 1 3 Quick dial numbers in SIM card You can dial the number stored in SIM card by storage index on dial pad Input the storage index of the contact of your SIM card and then click button the corresponding phone number will be shown in t...

Page 23: ...act book with super high capacity Each contact is a big social database which contains name mobile phone number home phone number business phone number FAX number address birthday etc R2811 contact book can be managed by groups and categories Contacts can be sorted into categories such as family friends colleague etc And you can define groups as well R2811 contacts book also provides custom functi...

Page 24: ...tact on contact list screen 6 Each contact contains name mobile number business phone number home phone number and FAX number and multimedia data such as photo and ring tone Type of contact Search the contact Contacts Select view manner View by List View by Thumb and sort manner View by Last Name View by First Name Number of contacts Family name index Go back to previous screen ...

Page 25: ... card Phone Delete Press to view events related to this contact and add new event for this contact Press to send Vcard of this contact to other by SMS A pop up menu will come up while hold a contact for a period of time by stylus 9 It has following menu items View details Dial Number Prepend Dial Send SMS and Send MMS ...

Page 26: ...rd contact because of short of storage memory while contact stored in mobile phone contains much more information Therefore the device will ask user to selectively store information while copy contact from mobile phone to SIM card since there s no enough storage space On the contrary user need to specify which item in mobile contact will store the information copied from SIM card 2 2 3 Search cont...

Page 27: ... 2 5 Groups and Categories Categories are usually used to category management For instance you can quickly search contact by selecting to display only some category or specify different ring tone for different category Groups are usually used to send group message SMS MMS included One contact can only be of a category but it can be of different groups 2 2 6 Manage Categories Select Manage Categori...

Page 28: ...put category name Select ring tone of the category Select led alert color of incoming call of the category Whether or not to private the category 2 2 7 Manage groups Select Manage Groups from menu on the contact list screen 6 to enter into groups management screen as following figure ...

Page 29: ... you need Input group name Select the type of the group SMS MMS E mail Press to select members of groups from the contacts Whether or not to private the group 2 3 Call Log R2811 provides 400 records of call log including 100 records of missed calls 100 records ...

Page 30: ...u will come up while hold a contact for a period of time by stylus 17 It has following menu items View details Dial Number Prepend Dial Send Message Save Number to and Delete Record Press a record to view details 18 View by Date View by Name View by Call Meters Click pull down box to select the type of record All calls Outgoing Calls Answered Calls Missed Calls Rejected Calls ...

Page 31: ... basic simple text message service of GSM network and is sent directly from one side to the other by point to point mode MMS Multi Media Messaging Service Multi Media Messaging Service is a great evolution of existed SMS and can be used to edit and real time send the picture audio and text information to implement the information transmission among mobile phones and from the mobile phone to the ne...

Page 32: ... of the icons in front of the messages SMS to be read SMS already read MMS to be read MMS already read 3 2 Read message Press Message Record in the inbox to read this message directly Click the pull down box to switch the mailboxes Inbox store the messages received Outbox store the messages not sent or failed to send Drafts store the unfinished messages temporarily Sent items store messages alread...

Page 33: ... then press SMS or MMS to add a new message If there is only text in the message it should be sent as an SMS if pictures or music is inserted into the message it should be sent as an MMS Menu Forward Message forward the message to other contacts Move message Delete message Save to the Contacts Reply by MMS Save to the Contacts Save contact information Applicable for message contains Vcard ...

Page 34: ...ds insert recording Press Recipients to input the number of a recipient Menu 4 Save to Drafts Press contact to select the recipient from the contacts book Press the top and right Insert Sound Insert Recording Select Contact Insert Slide Next Slide Previous Slide Delete Slide Play Select Group Insert Quick Message Insert Image Take photo Insert Video Capture Video New Drawing 带格式的 字体 默认 Arial ...

Page 35: ...delete message from the menu of screen 1 4 Calendar In calendar you can arrange your daily schedule to make the trivial affairs easier Menu Calendar 1 4 1 View calendar Menu Delete Month s Events Delete all Events Setup Set the week begins on day begins at retention period 带格式的 字体 中文 黑体 加粗 ...

Page 36: ...iew Day View Events Press to search your event You can search the event by subjection location notes or attendees 3 4 2 New event Press New Event to add a new event on the calendar screen 1 You can set Subject Location Note All day event or not ...

Page 37: ...recurrence Free Busy Tentative Out of office Important Business Personnel Vacation Must attend Travel Required Private or not Press to set the prompt time of the event 4 Press to add the attendees of the event 5 Press to set the remind mode of the event ...

Page 38: ...38 6 5 Application R2811 builds in such applications as eMail Memo World Clock Alarm Clock Calculator and Java Menu Application 1 5 1 eMail Menu Application eMail ...

Page 39: ...tup or a email account for initial use to enter email account setup 3 In account setup following items can be set Data Service GPRS CSD Receive and send email by GPRS or CSD eMail Address eMail Account Account password Configure POP3 Server ...

Page 40: ...o save on server Configure SMTP server Cell broadcast on or off View quick message or set new quick message Set the signature in Emails 5 1 2 Mailbox folder 4 Emails to be read Emails already read 5 1 3 Read email Press email record in the inbox to read this email directly ...

Page 41: ...l edit screen 6 You can input subject and message Press Recipient to input the recipient s address 7 Press Contacts to select email address of contract to Recipient edit box or click To CC BCC edit box to input the email address 5 1 5 Delete email Select delete emails from the menu of inbox screen 4 ...

Page 42: ...oice recording as memo Menu Application Memo 9 Menu View All Memos Notes Only Drawings Only Voice Recording Only Copy to T Flash Copy the note to TF card while the original one remains Move to T Flash Move the note to TF card while the original one is deleted Delete Delete all kinds of memos Meanings of the icons in front of notebook Note Drawing Voice Recording ...

Page 43: ...e friends and business partners Menu Application World Clock 10 Both the time for local city and that for the world city will be displayed at the same time 5 4 Alarm Clock Three sets of alarm clock are allowed to set and each of which can present its own repetition cycle Menu Application Alarm Clock Press pull down list to select world cities ...

Page 44: ...or 12 5 6 Java Menu Application Java R2811 can run the Java program Menu Turn All On Turn All Off You can set Whether enable alarm clock Alarm time Repeat cycle Alert music Whether vibrate Whether use the LED and LED color Change Image Snooze time ...

Page 45: ...camera function so the exciting moments can be recorded at any time and everywhere and the photos can be saved to the phone or the T Flash Furthermore it can be set as wallpaper or a face picture with incoming call The photos also can be sent to your relatives and friends by MMS R2811 supports various picture formats such as JPG PNG which can be set as the wallpaper to present your unique personal...

Page 46: ...ith incoming call 6 1 1 Take photos Menu Sight Sound Photo Camera to activate the digital camera 2 Press to select the resolution of the photos Press to digitalize the zooming Press to adjust the lightness Press to set the capturing delay time 0 5 10 15 seconds Press Capture to take photos Menu Show Information Mode Indoor Outdoor Evening Effects Full Color Sepia Black White Flicker Control 50 Her...

Page 47: ...he pictures 5 Press the 5 way joystick to take photos Tips Digital zooming varies depending on the size of the photo For the resolution 240 240 up to four times of zooming can be achieved For the resolution 1600 1200 the digital zooming will not take into effect 6 1 2 Review Photo 3 Press to edit the photo Press to set it as the face picture of the incoming call Press to send it by MMS Menu Origin...

Page 48: ...glasses and mask to the picture Press to select the color of drawing Press to view the entire picture and then return by pressing the photo 6 2 Video Camera R2811 can record wonderful video clips and save them to the phone or T Flash Menu Sight Sound Video Camera 5 ...

Page 49: ...es change from digital zooming to wide angle 2 Push the 5 way joystick downwards to zoom out the pictures change from digital zooming to long focal 3 Press the 5 way joystick to start or stop recording 6 3 MP3 player R2811 not only provides MP3 MIDI and AMR music playing function but also supports various dynamic playing effects which will make you enjoy wonderful music as much as you like in the ...

Page 50: ... Push the 5 way joystick left to jump to the previous track 4 Push the 5 way joystick right to jump to the next track 5 Press the 5 way joystick to jump to the next track and play 6 3 2 Play list Press View Play List to list all music in the phone or T Flash on the music playing screen 6 The music with a tick is that in the play list Press some music to add into or delete them from the play list M...

Page 51: ... Press to select the display mode View Thumb View List Press Start Slide Show to display all the pictures in the gallery automatically and set the switching speed of the slides and the background music Press the picture to stop playing during the playing 6 5 Play Video R2811 can play MPEG4 with postfix MP4 or H 263 with postfix 3GP video files and play with horizontal full screen to achieve the st...

Page 52: ...oy the fun brought by the wireless communications as much as you like Menu Internet Click screen to switch between horizontal and vertical full screen playing mode Return Stop Play Pause Menu Send by MMS Delete Move to the T Flash Phone Copy to the T Flash Phone Privacy On Off Playing schedule ...

Page 53: ...employ the network functions not only need you to order the data service from ISP but also set the internet settings correctly refer to Internet settings for more details Related knowledge GPRS connection GPRS is the abbreviation of General Packet Ratio Service which is upgraded from the GSM so it is referred to as the 2 5G mobile communication technology GPRS provides such features as always onli...

Page 54: ...ith STK function is inserted this function will be presented The concrete VAS application varies depending on the service operator 7 2 Browser Menu Internet Browser 3 Menu Refresh Page Refresh the current page Set Home Page Bookmark Save URL Open URL Saved Pages Save page Open page Clear Cache memory Clear data memory Setup ...

Page 55: ...okmarks The websites frequently access can be saved to bookmarks so as to facilitate the network operation 7 4Web History Menu Internet Web History The recent logging records such as website address logging time can be viewed Press a record to view the detailed information of each item 7 5 Saved Pages Menu Internet Saved Pages Some web sites can be saved to browse offline 7 6 Data Meters Menu Inte...

Page 56: ...n be selected to carry out wireless listening 8 Tools Setup R2811 provides overall and effective system management to set various parameters conveniently or individualize the phone Menu Tools Setup 1 Memory Usage View the use status of phone memory and T Flash card memory ...

Page 57: ...rnet function Calls Set the network settings incoming and outgoing call settings Message SMS setup MMS setup signatures and etc Internet connection setup and internet setup 8 1 Memory Usage Menu Tools Setup Memory Usage View the use status of phone memory and T flash memory card For this function T Flash card can be formatted by pressing Format T Flash in the menu of the memory usage screen 8 2Con...

Page 58: ... function between the mobile phone and the computer Furthermore it can provide the GPRS and CSD dial up service For the installation and use refer to the user manual 8 3 Modem Menu Tools Setup Modem R2811 can be used as a wireless modem USB cable can be used to connect the R2811 with the computer and then access the wireless network by GPRS CSD 3 4 5 ...

Page 59: ...nd time theme and sounds auto power on off security power save mode screen brightness backlight auto lock language reset factory settings user information an be set 8 5 1 Date and Time In the date and time settings following function can be implemented Select the display order of year month and day set the date set the time set the time format am pm 24 whether daylight savings Set the first day of...

Page 60: ...M PIN code can protect your SIM card from being stolen When the PIN code protection is activated you will be asked to enter PIN code every time the mobile phone is power on SIM PIN2 code can protect some important settings from changing arbitrarily If the PIN is entered incorrectly for three times successively SIM card will be locked and can only be unlocked by mobile operators Only when the PIN p...

Page 61: ... item is selected After the factory settings are restored the mobile phone will be power off automatically and all information the mobile phone saved will be cleared 8 5 10 User Information Your name and contact can be stored to your mobile phone or SIM card 8 6 WLAN VOIP Settings 6 8 6 1 WLAN setting Appropriated AP address can be selected and password is entered to access to Internet by which to...

Page 62: ... settings you can set the items as follows Search automatic manual Preferred List specify the prefer network for the phone to search for Select Network select the network used manually 8 7 2 Incoming Calls In the Incoming Calls settings you can set Auto Answer Tips For the material needed for concrete VOIP setting you need to request for it from specific operators ...

Page 63: ...busy Show my number It should be noticed that some mobile operators forbid this function So the phone can not be dialed if users set not to display his number Prepend It is often needed to add the area code national code or IP Tel ahead of the number before you dial the number in the contacts book or call log So turning on this prepend option will give you the chance to enter the area code or nati...

Page 64: ...ssage saved in the MMS center 8 8 3 Cell Broadcast Cell broadcast is a kind of broadcasting short message service You can automatically receive the broadcasting short message when in a network with broadcasting service if you turn it on and set a correct receiving channel 8 8 4 Quick Message You can edit some common phrase for the convenience of input Choose Quick Message on the Message screen and...

Page 65: ...to offline and time to auto offline Display Images Home Page DNS server Whether employ a proxy server The address of the proxy server and the port username password 9 Input operation R2811 is equipped with a large size touch screen and intelligent handwriting recognition You can write on the screen directly or use the stimulant soft keyboard on the screen to input The input area will automatically...

Page 66: ...haracters will be shown on the left grids press to replace that at cursor You can press corresponding character in the top bar to enter the associate characters directly Spelling input mode Input the spelling of the Chinese Character and corresponding Chinese Character will be displayed in the bar Then press needed character to finish it I Western letter input mode ...

Page 67: ...y to one letter Namely after an uppercase western letter is entered it will be switched to lowercase automatically AB denotes uppercase lock Symbol input mode Press the lock symbol highlighted by blue circle to switch the symbol lock status After one letter is entered it will be switched to other input method automatically The symbol can be entered continually Keyboard input mode ...

Page 68: ...o the context which can be picked by pushing downwards right pressing the 5 way joystick or the number key Press 1 to switch between capitalization and lowercase among three modes abc Abc ABC abc enter mode Switch to abc input mode by pressing key then press the corresponding key of the letter System will select matching words automatically Press 1 to switch between uppercase and lowercase among t...

Page 69: ...responding number 10 2 How to set time and date Menu Tools Setup Device Date and Time 10 3 How to set alarm Menu Application Alarm Clock 10 4 How to turn on or off the antenna Press the network name in the bottom center of the idle screen to turn on or off the antenna Press the network signal in the top left corner to enable or disable phone 10 5 How to take photos and set as a wallpaper 1 Menu Si...

Page 70: ... 2 Select Menu Tools Setup Connect PC to wait R2811 PC to set up the connection 3 Activate the R2811 PC tool software from the PC and connect it with R2811 Press Music button to copy the music files to phone or T Flash card Card writer is used to write the file to T Flash directly If you have a T Flash card writer there is no need to install other software The card writer can be used to copy the m...

Page 71: ...software from PC to connect with the R2811 Press Gallery to copy the video file to the phone or T Flash Card writer is used to write the file to T Flash directly If you have a T Flash card writer there is no need to install other software The card writer can be used to copy the music files to the sights directory of the T Flash from PC directly and then T Flash is inserted into the phone Note if s...

Page 72: ...ge indicator appears Cannot power on Poor battery contact Take out the battery clean the dirt in the contact point and reinstall it The battery is fully discharged and needs to be reactivated Plug in the charger and wait for about 10 minutes until the charge indicator appears Then go on charging till the battery is full Cannot charge Poor battery contact Take out the battery clean the dirt in the ...

Page 73: ...r on the mobile phone The phone is power off suddenly The battery looses Reinstall the battery The power of the battery is not enough Recharge the battery for 12 hours ignoring the fully charged signal The mobile phone is used too frequent Use it as needed Press the button unconsciously Keep your mobile phone carefully and avoid pressing the button The battery is aging Replace a new one The standb...

Page 74: ...ugh or network fails Move to a wide area and retry MMS is set incorrectly Contact your network operator and get correct settings Data service is not run Apply for GPRS service from your network operator Storage space is full Delete part of MMS The mobile phone of the receiver fails to support MMS or is set incorrectly Inform the receiver to take the corresponding measure Network overloads Send it ...

Page 75: ...Owe or pre paid has expired or been used out Contact your network service provider and recharge it Cannot access network Signal is too weak or there is no signal Network coverage is not enough or network fails Move to a wide area and retry Fierce vibration It may cause this phenomenon if the battery is recharged when it is nearly depleted Pull out the charger and take out the battery reinstall the...

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