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.
In flight, this means the cell radio is using full-power to attempt the connection… therefore draining precious battery power. So, the next time you're in the air, save yourself some headaches…and battery power. Just switch your device to airplane mode and then turn it off for takeoff and landing.
If you're relying on Wi-Fi, it's important that you turn off cellular data on your phone, otherwise you may inadvertently rack up international roaming charges. Skype, Google Hangouts and other apps also let you make free video calls with other users over an internet connection.
WhatsApp is typically safe to use when traveling. WhatsApp's end-to-end encryption ensures that only the intended receiver can decipher their messages and calls. However, it's crucial to be cautious when connecting to a public Wi-Fi network.
Should data roaming be on or off on iPhone? 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.”
When your phone is in Airplane mode, callers will hear the phone ringing, although it's not ringing on your end because your phone is not active. If the caller hangs up without leaving a voice mail, no notification will be generated as it would if your phone were in an active state.