I spent 1 hour with AT&T last night trying to get my APN settings right on my unlocked phone. After SCOLDING me for buying an unlocked phone (from Amazon) the rep tried to find the settings. While he was searching through their "tutorials" I found some settings (WAP.CINGULARGPRS.COM that would get me on the "E" network, but could not get LTE. They're still not right and the thought of another phone call is making me crazy. I have a mobile share plan which may make some difference, but I'll try anything!