GSM Gateway + Sip server

Could a GSM Gateway + SIP server be used to create better phone privacy/anonimity? I've been thinking about this for a little while now. With a gsm gateway (in a secure location) + sip software and connecting to it from wifi you could probably beat pretty much any form of telco tracking. You could get one of those devices for 60$ off ebay. What are your thoughts on this /sec/ ?

>>1977 The point of a cell phone is that you can take it outside your house and receive phone calls no matter where you are. You're not going to cover the city with a $60 device. It probably won't even cover your street. So why not just use wifi and forget the GSM part?

>telco tracking scare you can easily avoid triangulation with directional anthenna m8o no need for this voip bullsoykaf when you can use their system against them

>>1981 >you can easily avoid triangulation with directional anthenna I think you need to educate yourself on what triangulation is and how cell phone tracking actually works. https://thehftguy.com/2017/07/19/what-does-it-really-take-to-track-100-million-cell-phones/

>>1982 kek look at this smug bastard thinking I don't know what I am talking about fine then, do as you want f4g(Argue in good faith, avoid using personal attacks, and don't spill soykaf.)

>>1983 >With the angle of a signal, it’s possible to determine that the source is within a line (or a cone). Obviously, it works better with highly directive signals. Just use a directional antenna is piss poor advice. Maybe do some research before posting and stop talking like a 12 year old.

>>1984 it gives you better privacy than any other technique a cone is better than a point I will stop talking like a 12 year old when you stop condescending to others and start talking real arguments instead of "educate yourself dummy"

>>1986 >a cone is better than a point The cone turns into a line if you're using a directional antenna. You've somewhat mitigated one type of attack by making yourself severely more vulnerable to another. And these are not the only 2 attacks to worry about so yeah, not great. >"educate yourself dummy" Actually I spoonfed you the answer with a 3rd party reference. What more do you want?

>>1990 what if there are multiple directional anthennas at different distances and angles from 1 tower from 1 side? could that mitigate some tracking? >what more do you want? a honest 2 way discussion jerk

>>1991 >what if there are multiple directional anthennas at different distances and angles from 1 tower from 1 side? could that mitigate some tracking? Maybe. That's a good question. Using multiple antennas is called diversity, but I've never encountered transmit diversity before (although it apparently is a thing) so I'll be honest and say I don't know how that actually works. I'm going to look into it though.

Op here How would you even be able to add an antenna to your phone (considering most phone these days have it built in the case/mobo)? How would you make it not seem suspicious if it is on the outside. Do you get as much flexibility as with sip? (use it with a wide range of devices with for example a laptop)

>>1996

>>1998 btw, a digression for everyone's information. Most 3G/LTE USB modems have two CRC9 external antenna connectors under a piece of protective plastic with a "signal" icon. Lifting it up, simply getting an adapter to convert it to SMA and you'll able to use standard external antennas. Personally I use LTE modem, Raspberry Pi and OpenWrt wireless router to set a access point when broadband connect is not available and the signal strength is poor. The external antennas are critical to ensure stability. Be aware of the operating frequency of the antennas though, most designed for 2.4 GHz or GSM-only won't work. IPEX connectors are frequently used on PCI-E Wi-Fi adapters in laptops, and the smaller IPEX4 is common on nowadays cellphones.

>>2004 Hang on, if whatever internal/USB cellular module you have is by default radiating well enough to be picked up by multiple base stations which can then triangulate your position, then adding a directional antenna isn't going to change anything is it?

>>2005 It's a bit more complicated than that, but yeah. It's already detectable anyway.

>>1998 You only answered part of my question. Wouldn't it be a little suspicious if you had an antenna like that hanging from a device so new? Wouldn't you look like a terrorist? Do you get as much flexibility? As in being able to use it with SIP on a laptop, bypassing the whole smartphone problem?

>>2006 So what's the point of attaching an external antenna?

>>1977 SIP->SS7 gateway on someone else's computer is the best option. GSM gateways are not meant for anonymity, but rather for small businesses and cheap international calls when you can connect to hotel's wifi in Namibia and call your grandma using your home SIM without spending a grand. You need to power it and you need to connect it to the internet. The best uninterruptible way of doing that is to put it at home, not on your neighbor's cellar while stealing his wifi. Therefore here are 2 privacy problems: your home internet connection, gateway position according to GSM triangulation. A better option would be a commercial SIP gateway service. It is absolutely not related to your identity in any way, it has more reliability than home/piratebox variants, POTS calls are all recorded and analyzed anyways, so keep that in mind, but if someone tries to track you with public phone number, they will end up at gateway hoster, not your your home. If you want to carry your phone and use GSM, then you should take in account that your position will always be tracked and trafic activity recorded by cell towers, however if you send all your traffic and voice calls through tunnel like vpn and then connect to SIP-SS7 gateway, you pretty much have enough privacy because your public number is not related to your person or position directly. Here is simple route of your call >[Smartphone with SIP software {Traffic routed through VPN}]----[Your Cell Carrier]----[VPN/Tor/tunnel]----[Commercial SIP gateway{they can assign you multiple CallerID's for lulz}]----[SS7]----[target phone number] Oh, an it would be cool to have phone service in areas with no GSM but with some reasonably fast internet connection.