Huawei Ascend Mate7 MT7-L09 - Manual (Page 79)

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Phone settings
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On the home screen, touch Settings then the All tab. Under Wireless &
networks , touch More and then Airplane mode to turn on or off airplane
mode.
When airplane mode is on, is displayed on the status bar.
Setting the PIN of your SIM card
A personal identification number (PIN) is delivered with your SIM card to
better protect your phone data. If you enable the SIM card lock, you must
enter the PIN each time you turn your phone on.
Before you perform the following operations, make sure you have obtained
the PIN for your SIM card from your service provider.
1. On the home screen, touch Settings .
2. Under All , touch Security .
3. Touch Set up SIM card lock .
4. Select the Lock SIM card check box.
5. Enter your PIN, and touch OK .
6. Touch Change SIM PIN to change the PIN.
Generally, SIM cards only allow a limited number of consecutive retries
if an incorrect PIN is entered. If this limit is exceeded, you must enter a
PIN unblocking key (PUK), which you can obtain from your service
provider. The number of consecutive attempts to enter the PUK
incorrectly is also limited. If this limit is exceeded, your SIM card will be
permanently disabled. For details about these limits, contact your service
provider.