This will not help you but the strange thing that happened to my iPhone 4s. The phone icon disappeared
. When I search for phone the phone does show up in the search.
I wonder if this is because I set this 4s up then copied my information from my iPod onto this phone. Of purse the iPod does not have the phone icon.
This is ok because my iPhone has a bad ESN which is fine I use the phone for wifi calling.