I just got off the Fantasy last Saturday and it worked pretty well. There was some lag time occasionally that it took a text to go through. You do not have to use your wifi data plan to send the messages. The only strange thing was that on my daughter's iphone, it would occasionally change her settings to where it said iMessage waiting for activation. When that happened, I couldn't get her iMessage to work unless I logged in on her phone using my data plan to "activate" her iMessage again. After that, she could text again without any Wifi data plan.