Has anybody found an app that will sound an alarm when the phone is off...like the SE T610. The alarm on P910 only sounds when the device is on.
Uvatha
Alarm Clock
First of all, I moved your thread into the right place.
What you want is not possible. The only "solution" is to put your P910 in Flight mode, saves battery and you won't be disturbed by any calls/sms-es