[z33dev33l]

My new Lumia won't read my Sim. For about a second it reads that the ATT Sim is there, then it says the card is invalid. It doesn't seem to want to allow me to use my Sim. I tried a t-mobile Sim as well to no avail, same issue. It seems like a software issue that a hard reset won't fix. Any help?

[MattLFC]

Could be a faulty handset I'd guess, return it to the store, they should probably give you a new one.

:)

[jimski]

Are you using a properly provisioned LTE MicroSIM, supplied by AT&T?

Sent from my Lumia 900 using Board Express

[freestaterocker]

Are you using a properly provisioned LTE MicroSIM, supplied by AT&T?

Sent from my Lumia 900 using Board Express

It's an 800. No LTE.

[z33dev33l]

what freestaterocker said. Plus, I've tried three Sims. I hate doing the replacement thing for a free developer device.