Mobile Carriers in the United States

[bcnaz]

  
   I have been successful with 2 way voice calls and with 2 way texts using the prepaid AT&T sim card,  On Debian/Phosh.

  And calls out and 2 way text with Ubuntu Touch.

But I have not had any success yet with data service,  I do not know if it
 is software related

            OR

The APN settings  ?

       Any Ideas  ?

UPDATE :

After spending over an hour talking on the phone to the AT&T tech, he concluding it was a faulty sim card,
as it works for text and voice but system says I do not have a data account, which I do have the same sim card can access data while in my BLU phone.
SOO farther updates when I get a different sim card.