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.
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In situations where a power source isn't available, turn airplane mode on to stretch your device's precious battery life. Just remember that airplane mode disables your access to cellular data, so don't expect to be able to send text messages or make cell phone calls in this battery-saving mode.