I wish that someone would have come up with a more productive answer than the usual stuff that the apple store tells you that never works. Seriously, restart the phone, restore the phone, ahh, that must be the only problem with it. My phone was messed up with the 5.0 update, but then I was able to get the 5.0.1 update that helped with my calls. This update comes around and now where I had service, I don't anymore. My app store is terrible as well as my iTunes, on the phone; my calls are getting dropped with consistency. I have restored my phone in all the ways forms and fashions known, and reset it more times than I can shake a fist at. I know that it works because it was working for 3 months, pretty well too. Sooo, what's the deal, how can I go back with my 4S to a time when it worked. I just reset my laptop after I didn't like the way that Windows 8 consumer preview was running.