I posted this on Howard Forums also. But thought this is an important issue to address since we all know the next generation iPhone will support LTE data. http://www.howardforums.com/showthr...-(this-is-a-fact)-WTF?p=14787290#post14787290 But it appears ATT disables LTE data during a voice call. ATT tech level support confirmed this limitation to me also. You can call ATT to confirm yourself. You will drop down to 3G speeds. Not only that, I am barely getting 1mpbs when on a voice call. Why is this important? Matters big time for those who pay for tethering. Expecting LTE speeds tethering. But suppose you are on a 60 minute conference call on your iPhone LTE. Your spouse is tethering off your iPhone LTE and wonders why her wifi computer speeds are so slow. So ATT has a lot of explaining to do if they advertise the LTE speeds but don't clearly disclose you will drop to 3G data on a voice call. Another user on another forum had same almost exact speed drops as I did with LTE down to 3G speeds.