I have an unlocked Pre 2 that is working great with Straight Talk pre-paid service which uses At&t network. Internet and MMS all work since I have put in the correct settings. The only issue is the mobile hotspot app. I turn it on and it is detected by my other devices but no data comes through. I have gone into the advance settings to tinker with the DHCP setup but no luck. I don't have prewar installed, didn't think it necessary since mobile hotspot came with the phone. Any advice would be appreciated.