> so it doesn't matter much if they can access the Internet
Unless you have a limited cellular data allowance, or pay for data by actual usage. iOS allows you to disable cellular data for certain apps. It would be great if it could somehow figure out when I'm using a mi-fi when abroad, and treat that wifi access point as 'cellular'.
Android can be told to treat certain APs as limited usage, which means they're not used by apps that are set to WiFi only, or for which you've disabled mobile data.
Unless you have a limited cellular data allowance, or pay for data by actual usage. iOS allows you to disable cellular data for certain apps. It would be great if it could somehow figure out when I'm using a mi-fi when abroad, and treat that wifi access point as 'cellular'.