What is data roaming, anyway?
Data roaming means your mobile device (like a smartphone or tablet) is using a different data network than usual.
If you let your device “roam” in another country, data roaming charges can get expensive very quickly because you’re paying for the privilege of getting an internet connection internationally, on something that isn’t your “home” network.
If you arrive in another country and you haven’t configured your data roaming settings correctly, your phone or tablet will instantly try to sniff out the nearest network and connect you to it … and you’ll pay the price (literally) when you arrive back home. Ouch.