Hey guys. I just got me a iphone 4S, and when i use it it works perfect. But sometimes when i move from one place to another, i cant send sms and make/recieve Calls. Then i have to shut down my phone and turn it on again and then it works again. I work at this tele company doing netowork stuff and looking for errors in the 2G and 3G. To me when i look at the iphone, it says Carrier name plus 3G and 5 bars. but the phone dosent work. Then shut down and turn on again and it works again. Sometimes i see that when i try and call out, then it says "No service". and suddentlyg it gets reception. It is not the phone. I have a few customers that calls in with the same problem We have like 10 cases of this in the company where i work. Anybody tried this? Or somebody knows what happens To me it looks like the two antennas in the phone, looses connectivity when i travel from one location to another Maby handover problem of some sort.