Is anyone else having this problem. Just upgraded to IOS7 and my problem free iphone 4 is now full of problems...cannot keep signal strength, drops calls and does not ring even with four dots. Have done all of the applicable resets to no avail.
I am having the same trouble with my iPhone 5 signal after I upgraded. It mostly doesn't ring (occaisionally it does) and goes straight to voicemail- same with texts- no audible sound. This happens right inside my own house whre I never had trouble with any previous phones/operating systems. I've done all the resets.
My children and I all have the iPhone 4, 4S, and the 5S, neither of us had any problem with upgrading to iOS 7. I would suggest restoring your iPhone and setting it up as new, then transfer your data from a backup.