nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqwq8aszhx3cqfa5af0j2z6fnwxhu2fg3xcuy6m3ph4ut2hrg957fszth9ey I am aware of that. At least neither of the sim cards is directly linked to me. One is employer's and the other one is anonymous prepaid one.
Discussion
i gotcha. i meant something a little different.
for example, you purchased your other (non-work) sim card anonymously without kyc. however, that number is stored in your friends/families phones as "Jiri Eischmann". That information is no doubt uploaded by your contacts to various cloud services that either backup contacts (like icloud, google cloud, etc...) or messaging/calling apps (like whatsapp, signal, etc...).
So now that 'anonymous' sim card is trivially linked to you via many datapoints and it leaves a trail of location data 24/7 via cell phone triangulation.
However, let us say you instead used that anonymous SIM card for data purposes only. and used a non-kyc voip app to make your calls and that voip number were stored in your friends/family phone book. that voip number does not have a massive location history tied to it.