Huawei U7519 User Manual page 17

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Set the fixed dialer number list to define the numbers that your phone
can dial. This function needs to be supported by the SIM card.
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For certain SIM cards, you need to enter the PIN2 code to use special
functions.
If you enter a wrong PIN code or wrong PIN2 code thrice consecu-
tively, the SIM card will be locked. To unlock the SIM card, enter the
PIN Unblocking Key (PUK) code or PUK2 code.
If you enter a wrong PUK code or a wrong PUK2 code for ten consec-
utive attempts, the SIM card will get invalidated, and only emergency
calls will be permitted. Consult your service provider to unlock the SIM
card.
The PIN code, PIN2 code, PUK code, or PUK2 code is provided with
the SIM card. For details, consult your service provider.
As implemented in some version of this product, when the phone is
locked, user will not be able to dial any calls (including emergency
calls) until a correct password has been entered and accepted by the
phone.

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