As @xancudo mentions, you can use the AT&T network with https://usmobile.com and possibly some others, but follow here for USA carrier issues: BraX3 Telco Compatibility – United States
As @xancudo mentions, you can use the AT&T network with https://usmobile.com and possibly some others, but follow here for USA carrier issues: BraX3 Telco Compatibility – United States