To take a serious look at this scenario, being abroad at the moment without a foreign sim makes me really frustrated as to how greedily and wastefully apps on m

To take a serious look at this scenario, being abroad at the moment without a foreign sim makes me really frustrated as to how greedily and wastefully apps on mobile will use mobile data. Google is pretty bad about this with their array of apps, and I must admit I'm surprised that there isn't a function built into Android and iOS that triggers when the phone returns that it's on roaming data - the OS seems to be able to tell at a much deeper level than the apps run at so to me it seems like an easy path to have a true low bandwidth mode kick in, or at least offer to when the phone reports a roaming condition. I understand this is edge case material though so such ideas need not apply, but it seems like a fairly easy to implement idea that is one of those "oh that's really nice" features customers stumble across.