If you want to avoid roaming charges when you travel, you have a few options to consider:
Rely on Wi-Fi.
Purchase a daily roaming plan.
Turn off roaming altogether.
Buy a local SIM.
Get an eSIM.
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Airplane Mode turns off your device's ability to connect to cellular networks (meaning it can no longer send or receive calls or texts, or use data). As it is no longer accessing local cellular networks, it will not be charged roaming fees (caused by your device connecting to networks outside its home region).
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.
Check your Cellular/Mobile Data options and turn off Data Roaming. In the Settings app, tap Cellular, or Cellular Data, or Mobile Data. Turn on Cellular/Mobile Data, then tap Cellular/Mobile Data Options. Turn off Data Roaming.