Answer to: Why iPhone 4 doesn't vibrate?I used the method above, taking the back off, taking the motor out, and just resticking the tape that had loosened over the last couple of years that is to the left of where the motor spins. IT WORKS! Better than it has in well over a year! Super easy fix. I am not tech oriented when it comes to opening things up to try to fix them - but this was so easy, with the right tool anyone can do it. And I just used a philips head screwdriver from a precision set I bought at the dollar store. Total no brainer.