Well I can say my old Eris would not get a gps lock indoors at all but if I walked outside the second I seen a clear view of the sky, bamm it would lock on. Well with my thunderbolt I walked around with it outside with gps on for a few miles and never got a positive lock. It would be close within a few blocks but never really close. I tried reboots, clearing cashe in maps, changing this and that never locked. Last week I flashed bamf 1.6.2 and it fixed a few other problems but no gps lock still. I noticed the antenna on the back cover. If you pull it off you lose all service . I put a screw driver to the contacts and got 3g back . One side there is even holes in the cover. Most likely for 4g . Now what would it use for gps signal? The trianglation of the cellular network is close but not dead on. I hope its not a hardware issue .