It’s actually two separate aspects, there’s the network for crowdsourced finding, and there’s the localisation of unwanted trackers.
The feature that lets you ring nearby trackers is actually standardised between Apple, Google, Samsung and the others. It goes by DULT - Detection of Unwanted Location Trackers.
Are there similar projects that focus on the software aspects? Would love to read about that. For English text, you could probably get away with just typing half the letters and having the rest predicted, no?
Mobile Networks use symmetric keys for mutual authentication. You need the same key both in SIM and the carriers database.
What I guess you mean is, you buy an inactive SIM from Vodafone (which has Vodafone-known keys on it), and then you’re telling Vodafone to use that card.
By „bring your SIM“ I thought of something non-branded and was surprised.
Essentially that is what’s happening with eSIM, hence the need for the provisioning step that also makes transferring hard.
Never heard before this was possible. Do you have some example which carrier allows to bring your own SIM? Ideally, if you have some support page handy that’d explain the process.
Honestly, with normal SIM cards this shouldn’t be possible, as you cannot program the keys into the card. There are some eSIM-on-SIM-cards that you could use if your phone isn’t eSIM capable. But again, would be nice to check.