Received the jelly bean update a few days ago. Since then, my phone does not keep a signal. Use to I could leave it on LTE/CDMA and it would pick up 3G or a 4G signal easily. At home, depending on where I left my phone, would depend on the signal. Now, I'm lucky to barely pull a 3G signal. If I leave my phone sitting in one spot too long, the signal goes completely out, so I get no calls or texts. I can have a 3G/4G signal and try to pull the internet and the signal dies completely again. This was not a problem before the update. I try not to use my Wi-fi, but when I need to , since I have a lower GB amount. If, I manage to get a phone call, I can not sit down and keep the phone going. Thanks to such an iffy signal, I will lose a call the moment I become still. I have to walk around my house the entire call to keep the signal up. Even doing that, there are times that the signal becomes weak and my phone starts to break up. So far, I am not happy with this update. Is there anything I can try to improve my signal?