Is there a method or service to determine if a mobile phone is online?

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Kirill Ostrovsky2017-05-23 19:50:56

mobile connection

Kirill Ostrovsky, 2017-05-23 19:50:56

Is there a method or service to determine if a mobile phone is online?

Is there a way in the "background", that is, it is imperceptible for the user to check whether he is online. There is a mobile network.
It is necessary for such that in the online catalog with profiles, those who are not online, that is, with a disabled (not paid, not online, etc.) mobile phone, are lowered in the rating, but those who are online are not.

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