It's only happened twice, but I've noticed that my iPhone 5 was freezing once when I was trying to answer a call and another time when I tried to hang up. Both times were with my boyfriend who also has an iPhone 5, but he's on t-mobile while I'm on Verizon. I don't think it's a carrier thing because they didn't happen before. The time I tried to answer the call, my phone locked up (super laggy between the app I was using and switching to the phone), and I thought the battery had died (it was low at the time). But then I pressed the power/unlock button and it woke up like normal. When I tried to answer the call, the screen was unresponsive. It then went black and I woke it up and it was fine. This time I had plenty of battery. Has this happened to anyone else? I'm not totally pissed about it, but it's certainly annoying when the main function of a phone isn't working properly.