T-Mobile seems to really want your business, you jetsetting iPhone user (though they’re not the only ones).

For $70/month, you get unlimited data and texting — including while roaming internationally. And international phone calls to many countries, whether originating from the US or while roaming, are only $0.20/minute. If you travel often, it could save you hundreds, or thousands, of dollars.

That same amount also includes 2.5 GB per month of personal hotspot. There are no contracts. You can either bring your own phone, or you can buy T-Mobile’s iPhone, which starts at $649 for the iPhone 5s; you pay $149 up front, and $21/month for two years. If you end early, they just charge you for the remaining amount you owe on the phone; there’s no contract cancellation fee.

For an additional $10/month, after six months you can buy a new phone and trade in your old one without being on the hook for the remainder of what you owe; handset insurance is also included.

The other carriers are keeping competitive and are offering their own easy-upgrade layaway plans, in some cases contract-free. It’s a bit of a headache sorting it all out. T-Mobile appears to be the cheapest of the unlimited data plans.

This article is probably the best summary I’ve seen:

http://blog.laptopmag.com/iphone-5s-which-carrier-has-the-best-plans