Do you have to turn roaming on to use international data?
How do I get my device ready to use outside the US? Before you travel internationally, make sure your device's roaming is turned on so your device can connect to cellular networks in your destination country.
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Do: Turn Off Data Roaming. Before you get on that plane (or train) to leave the country, turn off both data roaming and cellular data on your phone. This will prevent your device from connecting to towers or networks along your journey, leading to pricey roaming charges from your carrier.
If you want to stay connected to mobile phone service even if you travel away from your cell carrier's network, data roaming should be switched “on.” But if you want to avoid fees and you're aware of the risks of losing connectivity, then you can turn data roaming to “off.”