Where will your son be? We arrive on Sept. 9!
We are AT&T and I am canceling our contract. First we are going to unlock our phones (on AT&T I can request an unlock online, since my account is in good standing) and then we are probably going to end up with a pay as you go SIM overseas; several phone companies offer them, so we are going to decide once we compare in person. We have Samsung Galaxy 5's and didn't want to buy new phones, even though they are "old" they work fine.
For texting our family, I believe we're using What's App and Skype/google hangouts (we're also keeping our phone numbers through google/Skype, but that's a different story. I'm just attached to my phone number).
If someone has better advice, I'd love to hear it too!