Find "Voice call"
Press Applications.
Press Settings.
Press Call.
Press Additional settings.
Press Call barring.
Press Voice call.
Cancel all call barrings
Press one of the following barring types to cancel it:
All outgoing calls
All outgoing calls
Int'l calls
Int'l calls except home
All incoming calls
Incoming when roaming
Key in your barring password (default is 0000), and press OK.
When the box next to the menu item is empty, call barring is turned off.
Repeat until all call barrings have been turned off.
Repeat until all call barrings have been turned off.
Exit
Press the Home key to return to standby mode.