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Regarding network signal strength

Hi there, 

Let me ask a question regarding signal strength. 

Every cell phone shows signal strength with the number of bars on the top right corner. 

I am wondering how the signal strength is technically shown software-wise. 

Is it programmed to acquire the RSSI by sending AT command with roop or is there a way to receive the RSSI in passive? 

Or it is not checking the RSSI, but different information. 

If anyone can help me, that is appreciated. 

Regards,

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