I have used many apps which dont demands for ops permission work offline , less battery consuming than the google apps work great such as xplorer (fewer permissions), musicolet mp3 player (no permissions)
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List item Can such apps be issue for data privacy ?
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List item If yes how would they transmit our data ?
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List item Can any app communicate with another app installed in the device in the backgroud?
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List item Can any game installed in a phone access internet browser app of the phone ?