Truecaller app notification some one trying to call
(1) Truecaller
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If you also use Truecaller on your phone, then you must have also noticed at some point that Truecaller sends a notification to your phone before the call comes. Even if someone's number is not saved in your phone, Truecaller still notifies you whose call is about to come. In this way Truecaller knows that you must have wondered sometimes how does Truecaller know whose call is going to come? Along with this, you must have also noticed that many times the OTP gets inserted automatically as soon as the OTP message arrives to enter OTP on an app. It is through this system that the application gets to know before the message what OTP is going to come. This is due to the difference between the speed of the cellular network and the frequency of the internet network. The network of every telecom company works under a fixed frequency. Companies use frequencies of 450 to 2700 MHz for making calls. Whereas any app work on internet frequency, which is around minus 2 GHz frequency. This shows that internet speed is much faster than call speed.
The reason is the frequency of the internet, this is the reason that due to the high frequency of the internet, the application already knows that the call is about to come. Truecaller detects the call through radio frequency even before the call is received. At the same time, due to low cellular speed, the call comes in a while. With this, the notification of the call comes a few seconds before the call is received.
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