Software on all phones scan towers and signal strength broadcasting IMEi to the tower. All segments of Voice, VOIP, data or MMS are labeled with identifiers.
VPN Carries all identifiers through a protected link and those signals can be identified at both ends of the vpn
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I’m currently testing a tech that has the effect of scrambling IMEI and MAIDs. When combined with a number scrambler, we are getting closer to anonymous. As you might imagine, some agencies aren’t super happy.
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