[barake]

Easiest way is to buy the device at Best Buy and then go to a physical T-Mobile store and setup an account. Go prepaid or request the deprecated "Even More Plus" plan - they still can set one up if you ask. Saves you about $10/month.

[bioweek]

So prepaid works? They allow it? Also are there any issues with keeping my AT&T phone number with the prepaid plan?

[barake]

You shouldn't have any problem with porting (unless you're under contract) or using a prepaid plan. "Even More Plus" plans are still available though no longer advertised and may save you $10/mo.

Also consider the T-Mobile reseller Simple Mobile. $60/mo gets you "unlimited" service.