Originally Posted by
docbert
There are no missing bands, and if there were you wouldn't be seeing a 4G signal.
Something is wrong with the way you have it configured, but if it's not APN then I don't know what it could be...
Yeah every time I had issue with no Data it was the APN settings. But maybe OP's phone is defective because he mentioned that he had problem even in US unless he put the sim card in Sim 1 slot. Maybe it is not a problem with US bought phone, but a problem with that particular phone?