I have had the Titan II since May '12 right about when ATT cranked up LTE in the New Orleans area. Everything was working great until I switched to the shared data plan which happens to include internet sharing. Wifi will not work if cell data is on and internet data sputters if it works at all if Wifi is connected. I've tried it with multiple AP's. If Wifi is connected I have to turn off my cell data. When I leave Wifi, I have to remember to turn cell data back on. If I get a group SMS, I have to turn cell data back on and "get media content" then turn it back off... Royal PITA... When something like this happens, it is a huge disappointment. I've had a WP since version 5.... While I am at it, another small complaint. If I am on LTE, getting a GPS fix is almost impossible while if I am on "4G" it works fine.. Other than these two problems, I love everything about my Titan II!