Blackberry selling Z30 Model: STA100-5
If you check out BlackBerry's website the model they are selling is posted. I have the same model and it is compatible with T-Mobile. It will also work with AT&T but it does not have the LTE band. The question is do they sell other models. The model that is completely (STA-100-1) compatible with AT&T I could not find so I switch to T-Mobile. My monthly bill was cut in half and service so far is great.
Copied from BlackBerry's website.
•16GB Internal Storage
•Up to 18 hours of talk time (UMTS)
•5" Super AMOLED Touch Display
•8.0 MP Rear Camera
•1080p HD video recording
•Compatible with GSM Carriers
•Phone Model: STA100-5
With the Z30 becoming available on BlackBerry's site, I can finally start recommending it to my friends, coworkers and family. I appplaud Mr. Chen and the BlackBerry team on getting behind one of the best devices. If you need a different model, you should call to see if they have it to purchase.