Ericsson GH688 User Manual page 63

This chapter lists some simple things you should check before
calling for service personnel. This could save you the cost of
unnecessary service.
The battery may have to be charged or replaced.
Ensure that the phone is properly inserted in its holder.
Check the fuse. The fuse holder is fitted to the battery cable, near
the vehicle's battery.
Enter the correct PIN or PIN2, and press YES.
If the PIN code has been entered incorrectly three times in
succession the card will be blocked. The following message will
appear:
EN/LZT 126 1353 R1B
1. Press YES to unblock the SIM card.
2. Enter your personal unblocking key (PUK) and press YES.
The PUK is obtained from your network operator or service
provider when you purchase your SIM card.
3. Enter a new PIN code and press YES.
You can of course also enter the PIN code you used previously.
If you have entered both the unblocking key and the PIN code
correctly, the message New PIN appears.
Note! If the PUK is entered incorrectly 10 times in succession the
SIM card will be permanently blocked. You need to contact your
network operator or service provider.
The procedure outlined above also applies to the PIN2 code. Use
the PUK2 to unlock the code. The PUK2 code is obtained from
your network operator or service provider.
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