Usually, to send an SMS or text message, you need to be connected to a cell tower. That’s not always the case though. Times are changing and cell phone carriers are making it easier than ever to stay connected.
For example, T-Mobile has introduced texting and calling over Wi-Fi. This allows you to communicate using Wi-Fi as though it were a cellular connection. You still need to be careful though. Just because you’re on Wi-Fi doesn’t mean your carrier won’t charge you.
Your best option to communicate over Wi-Fi while overseas is to use a third-party messaging app. This will allow you to communicate with your friends and family for free – as long as you’re on Wi-Fi.