I actually signed up for iPhone 11 Pro in the past with for 24 months and then decided to sell the phone two months later. I didn’t know about this sim lock thing. And the buyer didn’t ask as well. But I paid all my instalments, in fact it just finished. XD.

But I think if you decide to buy telco set, most likely it will get blocked. Not everyone will pay off bills on time like me. Tsk.