Android it's the same.Not familiar with droids but on iPhones you can disable cellular data use for any single app and monitor the usage of each app. The only time you really need data or wifi is to synchronize your flights to your account or download local maps. Neither use much data.
If you use wifi, then the cellular data is not available (would be nice to get maps) , at least on my S6 phone and tab S2.
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