I’ve gotten prepaid sims for things but obviously that’s not really a feasible method for your main life phone.
where i live, you can buy a sim card that you can then charge by buying codes on kiosks. no identity needed, all cash
They have your identity the moment you put the sim in the phone. The phone have unique identifiers that are recorded when sold.
Buy the phone used and/or with cash. And never put any SIM card in it that can be linked back to you or someone you know.
That would require law enforcement to obtain the recording and have a reason to do so
I mean, yeah? If I’m buying anonymous phone credits, the police probably has a reason to go looking for me.