I work in a building with poor cellular reception and often cannot use the phone for talk. In the past I used my iphone for its voice mail, and then would use a land line to respond to the voice mail. Three weeks ago, my phone began to ring and before the voice mail would kick in, the call was dropped. I purchased a new Iphone 5. Same thing occurs. The phone will ring a few times, then drop the call, without going to voice mail.