How to check subscriber status mobile network?
It happens that you need to know if the subscriber is currently online, but in no way does he bother. Is it possible to find out this information and not give yourself away? Can. The subscriber will not see any notifications from you.
Silent SMS Ping is an Android application that will let you know if the phone is turned on by sending it a “hidden SMS” (ping). The SMS will not be delivered as a standard SMS, the target user will not receive a visual notification of the receipt of the SMS.
The application does not require root rights and remains completely invisible to your target. You just need to enter a mobile number and send a request. After sending the ping, you will see the status of the subscriber. The source code of the project is available on GitHub.