E821S User Manual
Confidential and Proprietary Information of ZTE CORPORATION 35
Problem
Possible causes
Possible solution
(U)SIM card error
(U)SIM card malfunction or damage.
Take the (U)SIM card to your service
provider for testing.
(U)SIM card inserted improperly.
Insert the (U)SIM card properly.
Debris on the (U)SIM card contacts.
Use a soft, dry cloth to clean the (U)SIM card
contacts.
Unable to connect
to the network.
(U)SIM card invalid.
Contact your service provider.
You are not within the network’s service area.
Check the service area with your service
provider.
Poor signal.
Move to an open space, or if you are inside a
building, move closer to a window.
You cannot answer
incoming calls.
You have activated the Call Barring feature.
Go to
Settings > Call Settings > Call
Barring
, and then select
Cancel all barring
.
You cannot make
outgoing calls.
You have activated the Call Barring feature.
Go to
Settings > Call Settings > Call
Barring
, and then select
Cancel all barring
.
You have activated the Fixed Dial Number
feature.
Go to
Settings > Security Settings > Fixed
Dialing > Fixed Dialing Status
, and select
Off
to turn this feature off.
PIN code is
blocked.
You have entered an incorrect PIN code three
consecutive times.
Contact your service provider. If the service
provider provides the (U)SIM card’s PUK
code, use the PUK code to unlock the (U)SIM
card.
Unable to enter
information into the
phone book.
The phone book’s memory is already full.
Delete unnecessary data from the Directory.
