Can I text from Holland to America?

I live in the US And I'm currently visiting Holland and ill be here for a month. Someone mentioned that I would be able to text my friends in America with my phone. Is this true? I have an iPhone with AT&T (i don't know if that makes a difference. I have the unlimited texting plan… If you could let me know that would be great!

You can text, but it will cost extra. Any phonecalls, texting, or data will cost extra

here are the roaming rates
http://www.wireless.att.com/travelguide/coverage/coverage_details.jsp?CIDL=528&MNC=CING

Yes if you have international roaming. It will cost extra and won't be covered in the unlimited texting plan. If you have access to Wi-fi, it might work out cheaper to message them through Facebook or Whatsapp.

I have a friend who visits Kenya and Nairobi frequently. I can receive texts and send texts at no charge. However he pays his carrier for texting me in the states.