VoIP vs SIM for privacy

applesbana

applesbana the provider can see that someone with a particular imei is swapping SIM cards monthly and can track that imei location. But importantly, they don’t know that is me. Right?

They will know that the phone is yours only if you give the carrier your identity when you buy the sim. Otherwise you'd be pseudonymous. But they would be able to tell that all the sims are owned by the same person.

applesbana if one tried to reverse engineer my location from my voip number, it wouldn’t be possible as it isn’t linked to my sim (and therefore location)

Normally, the average person won't have access to a phone's location data, but the parties that do would see your IMEI at your house and they could use that to determine your identity. This might be a benefit of VoIP if you are worried that the parties that see that number will be able to access that location data.

There are other pitfalls to avoid, like the fact that most VoIP services are not anonymous, and even with anonymous VoIP your calls are not encrypted and can be read by the network on the receiving end. If you share your identity over a text message, the network will see that.

applesbana It all depends on your threat model. I'm fine with using a prepaid SIM for data and some calls and even listing it as my contact number with someone like my bank. Being totally unprivileged party they won't have access to my constant whereabouts. My telco does, but they won't have personal information to tie it to. However, if a bunch of these (and related) parties collude together I can of course be quickly deanonymized but it's not in my threat model.

Additionally when I travel I pollute my clean IMEI (paid for my device in cash) by swapping out my home prepaid SIM for pesky (but very prevalent) KYC SIMs and thus accumulating a laundry list of SIM cards associated with my ostensibly clean IMEI. I haven't listened to Bazzell podcast in a while but when I did he oddly never seemed to mention it as an issue.

If you're dead set on switching to VoIP and are from US JMP.chat over their Cherogram app is what you're looking for. Their dialer integration and no PII sign up is the closest you can get to no hassle setup. I tried a bunch of VoIP solutions prior to them and some of them were much worse (PII, KYC, no 2FAs or bad 2FAs etc.) than just using my local telco.

And as was already mentioned by @nodsocket you will achieve absolutely nothing by regularly swapping out prepaid SIMs other standing out like sore thumb and possibly even attracting some unwanted attention to yourself.

Cellular privacy is truly a lost cause.

[deleted] The only way to gain a brand new cellular identity (and start polluting it anew) would be to buy a brand new device and new prepaid SIM, and even then, privileged actors (such as the law enforcement) can de-anonymize you almost immediately.

Skyway

I use jmp.chat its a bit odd to get setup but I'm impressed with it .

Only in a sense that you need to run XMPP client on your device which I normally wouldn't. But with more traditional VoIP setups you need to run some SIP client and these are pretty much all terrible, Play or no Play. I would rather run Conversations or Cheogram and do my calls over XMPP than deal with Linphone.

Anything over cellular network should not be considered private .

JMP promise not to log but your calls with them still pass "through many phone companies outside of your control or influence, including, but not limited to, the phone company of your recipient". In any case you decouple your location data from your calls which is what OP is looking to do. So instead of Bob calling Alice from Target parking lot it's "Bob calling Alice".

You can use MUDI router to connect your phone to the internet using vpn or tor. every month/week you can change the data simcard whenever you want but before you change it, you need to reset the imei using BLUE MERLE then you can insert the new simcard.

Here i use

disposable DATASIMCARD(inserted on mudi) + VPN (OVPN) + GRAPHENEOS (PIXEL 6a)

make calls for some clear-line i use (mobilevoip)/VoIp Raider
receive calls only through simplexchat or signal (fork)

on my laptop i use qubesos connected on ethernet port on mudi + sys-whonix + internet

thats it.

ps: blue merle only works on firmware version 3.215 but i have recently sent an email to nicholas farnham and hey plan to release further updates in the coming months so this may change, anyone can see the updates on theyr github repo once they have been finalized.

mucr they have released a new version of mudi (v2) and blue merle works like a charm on newer firmware you can also setup the switch button on mudi to change imei whenever you want..