and or the M7? I'm finding the software for using the compass and accelerometer on the 4s under 7.0.2 ( compass and inclinometer ) seems a bit flaky. compass seems to 'lockup' at crazy declinations for minutes and then oscillating then locking up. my iphone 5 under iOS 6 was not nearly as crazy. now under 7 both phones seems to be crazy sensitive accelerometers compared to the prior iOS release. So I doubt it's HW, and more a SW issue.
10/17/13 at 4:40am