haier D1200P - Manual (Page 20)

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It is recommended that you charge the battery for three hours (full charging
period) before you use it.
Do not pull out the plug of the charger during charging to avoid electrical
damage to the phone and the charger.
If you connect the headset with the phone, it will be to activate headset mode or
to match the volume of headset with that of mobile phone.
Increase or decrease the volume through up and down side key during call.
If you plug out the headset from the phone, the phone will return to normal
mode automatically.
Press and hold down the red key to switch your phone on or off.
If you switch the phone on and there is no RUIM card inserted, the phone
displays '
'. Press key to only dial emergency call.
After inserted, the phone will check whether the RUIM card is valid.
Then the screen displays the following messages:
Enter PIN --- Request to input the RUIM card PIN code (if required).
Enter Lock code --- In idle mode, press key to request to enter the phone
2.5 Headset
2.6 Switching a Phone On/Off
Please insert RUIM