New Sim with new number on old device

DrTSS wrote:

Hi, I bought a new sim with a new number on my same/old iPhone.

1.What will happen to my block list?

It won’t affect your block list.

2.Contacts from my old number will be notified that I have a new number?

No, you would have to notify the contacts you want to know about the change.

3.I am changing to a new number coz my old number has been widely circulated and am getting unwanted calls. Will changing to a new number help get rid of that problem?

Yes, that’s one way to limit the problem. It won’t stop spammers that send to numbers randomly, but it will stop anyone else.