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Problem
• USIM card malfunction or damage.
• USIM card inserted improperly.
USIM card error
• Debris on the USIM card contacts.
• USIM card invalid.
• You are not within the network's service
Unable to
connect to the
area.
network.
• Poor signal.
You cannot
You have activated the Call Barring feature.
answer incoming
calls.
• You have activated the Call Barring
feature.
You cannot make
• You have activated the Fixed Dial
outgoing calls.
Number feature.
You have entered an incorrect PIN code
PIN Code is
three consecutive times.
blocked.
Unable to enter
The phone book's memory is already full.
information into
the phone book.
42 Confidential and Proprietary Information of ZTE CORPORATION
Possible causes
Possible solution
Take the USIM card to your service provider for
testing.
Insert the USIM card properly.
Use a soft, dry cloth to clean the USIM card
contacts.
Contact your service provider.
Check the service area with your service
provider.
Move to an open space, or if you are inside a
building, move closer to a window.
Go to Settings > Call > Call barring, and then
select Cancel all call barring.
Go to Settings > Call > Call barring, and then
select Cancel all call barring.
Go to Settings > Security > Fixed dial
numbers and select Status to turn this feature
off.
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.
Delete unnecessary data from the Contacts.
F870E User Manual
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