Trusted WiFi when Traveling
Even with a global plan/feature enabled or with using an in-country provider, cellular data is always more expensive than using a trusted WiFi network, like eduroam or a corporate/school network at your destination.
Disable cellular data and data roaming on smartphones and tablets except when absolutely needed, since email, map and other apps are often using data even when you're not using the device. Close apps running in the background on devices when possible.
Source: Dr. Rochelle Newton
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