this works perfectly. Been searching the web and this is the best instruction so far. For reference I have a HTX One X - I had to cut the standard SIM to fit into the micro SIM slot. I went to settings, clicked on the mobile icon, clicked Access Point Names, add entries according to Garst instructions by clicking on an icon far upper right, "menu" choose New APN, once added, click menu again to save. To reset turn off mobile and it works perfectly now! thanks again.