My 4 has a nice but kinda weak vibrate. The 4S has a stronger vibrate but it's also giving off a loud "sound", it sounds like a muffled car horn. Recording of the noise Is the vibrate just stronger in the 4S or is this a defect? If I squeeze the sides of the 4S while it's vibrating it stops the sound, this is why I suspect it might be a defect. This isn't a huge issue, but it is slightly annoying, the rest of the phone is pure perfection. Thinking of taking a trip to the apple store to see what they say but I was curious if it's only my phone or it's common, don't really want to make the 40 min trip for nothing.