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Isn't this the same thing as a VPN?

No, it's a financial blind: from the telco's point of view, the only subscriber is Purism. From your point of view, your telco is Purism.

Nevertheless, once you start spending 8 hours/day in the same spot for days on end, it will be pretty easy to link you from tower records to traffic, and then to your real world identity.

Those like me who dislike cell carriers selling our location data are best off using cellular data sparingly and not consistently at fixed locations when there is available wifi.

Combining this with financial blinding and you can likely use LTE at a protest in an oppressive country without much chance you get pinned down there and arrested later.

This: you can keep a Librem 5’s modem’s hardware kill switch flipped to off when you’re staying in the same place for 8 hours.

I think it additionally protects people from identifying you by your phone number without a subpoena.

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