MR1100 unlocked w ATT sim card won't connect to internet

[MikeWMC111]

All:  I have been hours with Netgear on chat, and with ATT, and no one can tell me why the ATT prepaid sim card installed on the MR1100 won't allow me to send/receive data.  The sim card is recognized, the MR1100 shows that eh ATT sim card has a good signal, but the "cellular signal is disconnected".  

The Netgear tech group recommended adding a new APN, which we did, and it doesn't work.  Now the Netgear tech group on chat is recommending a live conversation.  ATT says it is not a problem with the sim card.  Can anyone help?  Mike

[Rachil]

Did you ever get this resolved? I have been able to fix mine. Please let me know if you did, and how you did it.