haier D1200P - Manual (Page 22)

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the RUIM card will be automatically locked. In this condition, the phone will
prompt for PUK (PIN Unlocking key). You can get the PUK from your mobile
phone service provider.
The phone lock code is used to protect your phone from unauthorized use.
It can be set automatically to lock your phone each time it is switched on or
when in idle mode. In this condition, you can only dial emergency call.
You must press
key to enter correct phone lock code, and then access the
phone menu (The default is 000000).
The PIN code and Phone lock code can be changed.
To dial a number, your phone must be switched on and unlocked.
You can use the function only after the network-prompting icon is shown on the
screen.
Enter district code and telephone number or mobile phone number, press key
to dial.
Press key to delete a typed number. Press and hold key to delete all
2.6.2 Entering your Phone Lock Code
2.7.1 Using the digits keys
2.7 Dialling a number