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 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 
 I thought the phone number was optional? 
 They are, you can select with number or not or just data 
 There is always a phone number whether it is enabled for voice and text or just data. In addition though, there are other unique numbers associated with your sim and IMEI is the one your phone sends to every tower to handshake with to receive service. 
 https://silent.link/rates https://image.nostr.build/db295a835d6119ab7f204156fe645f916b8f34b001b083a0528953b6921e7bbb.jpg  
 Yeah I don't see a number. Anyways I was referring to the IMEI which is a unique identifier. 
 Yeah nothing we can do about that unfortunately 
 There is a mitigation provided by PGPP, it uses a zero'd out IMEI, and some other cool things to thwart triangulation, reducing the precision to an area instead of a pinpoint. I think an important factor is number of users for the "hide in a crowd" effect, and I don't know anything about how many users they have. Also I want it to be open source but given their background I doubt it ever will be, it would have to be re-implemented based on their white paper.

https://invisv.com/pgpp/