You have to manually set the internet settings in the phone. You should be able to use the default data settings for any current smart phone on At&t. Unfortunately, since At&t doesn't sell or support your phone directly, their tech assistance will be minimal. Check your phone's user guide to change the internet settings in the device.
I have the "China" brand Sciphone 9. I am trying to configure the internet to work with my AT&T carrier but am unsure how to do it. Everything else on the phone works great with AT&T. Thank you for any help.