ATT may want to think twice about the name for its prepaid GoPhone service — its not just for phones anymore. You can now bring your own tablet to the no-contract offering, with pricing similar to what weve seen on the carrier before. Spending $15 per month will get you a (frankly paltry) 250MB of data, while bumping that up to $30 or $50 will get you a far healthier 3GB or 5GB, respectively.