My understanding is that data roaming uses different towers or something and that determining location is more difficult that way. Maybe I’m wrong.

The value of silent.link is the number is not KYC, no account data to go along with the number. But the number is connecting to the towers, and that's triangulated precisely. Frequent location spots like your home will help deanonymize it. There is INVISV PGPP that mitigates these things but it's not open source