When the phone is ringing, is it possible to set such that it gradually increase the strength of vibration instead a predefined strength of vibration? (When the vibration mode is turn on but the ringer tone is muted)
The concept is something like the 'gentle alarm clock' that will wake me gently, rather than jolting me from my slumber. (It work by having the alarm that gradually grows louder and louder until it becomes impossible to sleep through.)