I recently purchased an iPhone 5 with ATT network. It worked halfway, and now not at all! Both companies are pointing the finger at eachother. I think it is the Apple ios 6.0.1 software upgrade. I can't even get a tether at all for a few days now. I've tried every reset, reboot, network settings, restore feature, and finally a new phone. If they don't get it fixed I'm going over to a S@msung Galaxy III and Verizon.