Why iphone 4 is not vibrating at all?

My husbands iphone is not vibrating at all only can ring… So he can't keep the mobile in silent mode and get the calls or msgs… Any ideas how to make it vibrate?

I have the same problem with my iPhone 5 ☹
I took it in to the apple store and they did something and it worked for like a week so now I have to take it in again. Try taking it to the apple store

You should try going into the settings of the iphone then go to the sounds, after that you should see two things that say vibrate on ring and vibrate on silent they might be off.

You have to go into settings and under sounds, switch vibrate to on.

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