Please forgive me if this has already been posted, as I couldn't find this amongst recent posts: Though we all know that 4G allows us to talk and browse at the same time (ala Att's iPhone), I was surprised that this works even with a very poor signal. I tried tonight inside my house (don't get me started on why 4G works well outside the house but not inside). Speed test was @ .55 mbs, yet I was still able. I'm pretty sure most of you already knew this, but I hope that someone finds this info. useful. Just be sure to watch the battery!