The basic $10 plan includes international calling and unlimited international (but not domestic) texting. There is also a $25 plan, which adds unlimited messaging in the U.S. In between those options is the $15 plan, which offers international calls and texts to Puerto Rico only. T-Mobile will also extend discounted long distance rates to countries not on the list.
The International Talk & Text option is also available on family plans, but you will have to pay the same amount per each international line. Sorry, no group discount. Phone cards are great, but this plan will be more suited to those who frequently call abroad.
We're not complaining, but we think there should be an option for prepaid subscribers as well, even if it costs a little more. T-Mobile obviously needs the international plan to be contract-only if they're going to get people to jump on T-Mobile's bandwagon.