I was just on the Fantasy 2 weeks ago and it mostly worked for us. I left the app open and almost always received notifications that there was a new text. The one time it didn't work was when I was at Palo for brunch. The app was open and my phone was showing I was connected to the wifi. I tried to send a text and received notice that I was wasn't connected to wifi. I shut the app down, disconnected and then reconnected to the wifi, reopened the app and found a string of messages from my DD asking where I was, when I'd be back to the stateroom, and if she had my permission to go buy a small souvenir. Luckily it was nothing earth shattering that I missed, but it did make me nervous since I was giving DD a bit more freedom than usual with the caveat that she had to check in periodically.