Comment by phh
5 months ago
I'm curious why they are using actual modems rather than just doing it with VoWifi that merely requires a SIM card reader (pretty much just an UART)
5 months ago
I'm curious why they are using actual modems rather than just doing it with VoWifi that merely requires a SIM card reader (pretty much just an UART)
Among other things... having hundreds of calls and texts onramping from the same IP would be a rather large red flag.
I'm a little surprised that a behavioral analysis didn't flag these anyway. Probably did, just the networks don't care as long as they get their cut.
> networks don't care as long as they get their cut.
Pretty clear this is the case, almost all of it could be stopped overnight with a simple whitelist to people you know and a blocklist of countries and regions where you’ll never ever need to take a call from.
>having hundreds of calls and texts onramping from the same IP would be a rather large red flag.
Use VPNs? Surely paying for some subscriptions at $3/month is cheaper than renting an apartment in manhattan?
You'd probably need thousands of residential IP addresses to pass under the radar with so many SIM cards.
4 replies →
They do this so they are harder to track & block. If they were sending over Wifi then they have to hide the IP, so they have to use VPNs, which are often blocked, etc. But with their solution they have a standard SIM on the standard cellular network, so it's nearly indistinquishable from a regular cellphone.