Are there any bitcoiners on CH that have given up using the SIM card? Many modern android smartphones have esim and there are many services that allow you to anonymously download esim with an internet package. Combined with a confidential OS like Graphene OS, I think it would be an interesting experience.
After all, in fact, why do we need a phone number in 2023? For banking applications? two-factor authentication? (this is evil. Don't use your phone number for this!)