Soon After this, The bottom station sends an Id Ask for, which the cell phone responds to with its IMSI. The cell phone does this because the IMSI is saved on your SIM card, which was issued by your cell provider, as well as cellphone network ought to discover you https://www.shoghicom.com/all-products/wideband-passive-gsm-monitoring-system
About 3G/4G GSM Interception
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