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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You can use airplane mode to avoid roaming charges when travelling. You won't be able to send or receive text messages or phone calls, or use data services, but you could connect to a Wi-Fi network to check your email or browse the internet.
The general rule is that as long as you spend more time at home than abroad, or you use your mobile phone more at home than abroad, you can pay your standard domestic prices for your calls, texts and data services when you travel in the EU. This is considered a fair use of roaming services.