Zte Z431 User Manual page 43

Z431 User Manual
Problem
Unable to connect
to the network.
PIN code is
blocked.
Unable to enter
information into the
phone book.
Possible causes
(U)SIM card inserted improperly.
Debris on the (U)SIM card contacts.
(U)SIM card invalid.
You are not within the network's service area.
Poor signal.
You have entered an incorrect PIN code three
consecutive times.
The phone book's memory is already full.
Confidential and Proprietary Information of ZTE CORPORATION 39
Possible solution
provider for testing.
Insert the (U)SIM card properly.
Use a soft, dry cloth to clean the (U)SIM 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.
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 Directory.