I've read several discussions about the iPhone 4S dropping calls. Almost every single call I get is dropped at least once, maybe more. This has been going on for months. I blamed my husband's old Nokia phone that was ten years old, but he just got a new one and calls are still dropped. My daughter has the brand new iPhone 6? and it still happens. It seems lots of people out there are having the same issues. I do not want to pay to upgrade my phone, as my contract is not up. Any ideas on how to make it stop happening???? Change to AT&T?