I intend to create an app that detects a call and if it is strange, blocks it and sends an alert to the user.
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Thank you very much for your help, how can I put this app in the background? To detect the phone number, should the person use my app to make calls or will the app automatically detect the calls?
I think this is not impossible to be done but it would require a new extension to do this. At least I never heard about an extension that can do this…
Such app require approval from Google play console