I was having this issue too. ATT iPhone 5 purchased in June 2013 and suddenly I couldn't see wireless networks in the menue unless I was sitting on top of the router. Would also lose LTE and/or 4G connection and was on Edge. My battery life was horrible because the phone was always trying to connect to something. Went to both ATT and Apple for help. ATT sent me off to Apple, and Apple had me reset my network settings. I tried that, and the issues continued. I saw on a different forum something about the antennae being in the back of my phone. I had just recently put on an aluminum chrome case that I purchased from eBay (http://www.ebay.com/itm/400445259608?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m143 9.l2649). As soon as I removed that case and put back on the plastic one, the connectivity issues are gone. The case must have been blocking the signals. I would recommend removing your case and seeing if the problem improves.