The Dell Streak 7 tablet is available from T-Mobile for $200 on contract, or $450 if you go the contract-free option. But it turns out that you can pick up a Dell Streak 7 from T-Mobile, unlock it, and use it with AT&T’s network.
That’s because the tablet has an HSPA+ modem which actually supports both AT&T and T-Mobile’s wireless technologie. That means you can access either carrier’s 3G and 4G networks (if you consider HSPA+ to be 4G). You just have to unlock the device.
Right now the easiest way to unlock the Dell Streak 7 is to use UnlockStreak. The company will sell you an unlock code for $49. Once that’s done, you can just insert an AT&T SIM card and start using the tablet on AT&T’s network.