Looking for a iphone app like I had on my treo. You could select to silent your phone for a length of time (30,60 ,90 minutes). So if you set it for 60 minutes. Then, if a call or sms came in during the next 60 minutes, the phone would vibrate. After the 60 minutes elapsed, the phone would automatically resort back to normal ringing. I loved the app because I always remember to silent my phone, but I never remember to switch the ringer back on and then I end up missing calls. If I went to church or a class, I could just put it on vibrate for the next 90 minutes and know the ringer would autimatically come back if I forgot about it. Does any thing like this exist for the Iphone?