How do I set my alarm on my iPhone to vibrate?

I don't want my alarm to make a sound when it goes off. Is there a way to set it so that it only vibrates?

When the ringer is on, I obviously want the alarm and timers to sound as usual. However, is there a way to make them vibrate only when I put my phone in silent mode?

If my phone is on vibrate and I have an alarm set will my phone ring or just vibrate.

I've set up an alarm to wake up too which only go off on weekdays, which is great. Is the a way for it to recognise bank holidays and not set off the alarm?

I want to have my phone ringer on and NOT be in silent mode but have my text message (SMS) incoming alert set to vibrate. Any hints tips or suggestions are welcome. Oh, I have a iPhone 3g 8gb

I having some problems with the alarm clock on my iphone. I set the alarm the night before to wake up at 6am BUT my alarm rings at 5am WHY WHY? I thing i change the time settings on my phone and set the correct time, but keeps waking me up one hour earlier...

I am using the standard iphone alarms. By most effective, I'm asking, how many minutes before I wake up should I have my first alarm set and how should I set the gaps between following alarms. Not sure about you guys but I'm not the type of person to...

So..my mom wants me to have an alarm clock for this eating pattern: 7, 9:30, 12:00...etc. But im scared that it will go off in class because if when i put the phone on silent or vibrate the alarm is still very loud with sound! Can anyone help me keep...