If you call from Europe to USA, it's more expensive per minute than if you call inside the USA. So you'll have to pay for the extra costs. That's for both calling and texting.
If your friends call or pay you, they pay the costs until the USA border. How much that is, depends on their plan, of course; that's exactly as it is when they call you and you're at home. And you pay for the extra costs (the transmission from the USA to Europe, and the costs of the European provider).
You should check the details in the small print in your t-mobile contract or on their web-site.
OK.... so i have t-mobile with 2000 anytime minutes and unlimited txt.
I will be going to Europe for a few weeks (Countries: Germany, Austria, and Switzerland)
I want to know if there are any extra costs if i call/ txt from those countries to someone in the us (friends and family). How dose it also work if i call/ txt my friends that came with me to europe and they have US plans. Any Extra costs at all??????