Month-to-month billing is a great way to go for those who aren't going to be traveling with their tablets all the time. If you'll be a more frequent mobile data user, but still don't want to get stuck with a contract, AT&T is introducing new post-paid plans. They can be added to an existing wireless plan (single billing FTW) and will see you billed automatically every month, but now you can cancel whenever your heart desires. Initial pricing is on-par with the pre-paid plans, which means $14.99 for 250MB or $25 for 2GB. It's only the ove
