Unfortunately the phone radio in the iPhones have always sucked. All my friends and family who own one have trouble keeping a connection and I have trouble hearing what they are saying. The phone part of iPhone is total garbage. If Apple depended on iPhones to sell based solely on the quality of the phone radio therein incorporated, they would be bankrupt rather than the richest company in the world. Couple that terrible phone with AT&T and you have perhaps the world's worst phone. Two tin cans and a tightly stretched string work better and are more reliable.