I've only ever used PAYG, I don't like the idea of a contract for my mobile - I like being able to dump/swap numbers at near zero cost by just going to a corner

I've only ever used PAYG, I don't like the idea of a contract for my mobile - I like being able to dump/swap numbers at near zero cost by just going to a corner shop and getting a new SIM. I also don't believe in registering my mobile number to my identity. Anything to claw back a bit of privacy.