I have a Sony Xperia SL LT26ii I've had this phone for about a week and it worked fine up until about a day ago the network started dropping and i'm not able to make calls. I still have Data service and getting 3G and i'm able to browse the internet and everything else except make a call. When I restart the phone the network bars come back up and everything is good for a few minutes, i'm able to make calls and then it goes again. I've tried restarting the phone, taking out the sim and putting it back in. I've uninstalled apps to see if it was an application problem but that didn't help either, I've also done a complete factory reset and still no good. The sim works fine in other phones and as i mentioned before i still get my network providers 3G network and i'm able to browse. Just not able to make or receive calls Can anyone help me please?