[Q] New Z1 C6903 - No data at all on AT&T topic

I just received my Z1 and had AT&T provide a new SIM for use in it. Cellular works perfectly and I can send/receive texts but the handset will not do any data transmission at all. I understand the likelihood of getting LTE is slim but it's not picking up the other networks either.

Are there any things I should try? I've played around with different APNs to no avail already.

TIA.