Joke Collection Website - Blessing messages - What should I do with the messages left by various accounts after the mobile phone number is no longer used?

What should I do with the messages left by various accounts after the mobile phone number is no longer used?

The number cannot be changed,

You go to the mobile business hall to ask this question,

Some things can be solved by technology,

If you just want to change a tariff, you can directly call 10086 to change it.

It should be possible to exchange foreign cards for local cards. You can find out through consultation.

If you just want to change a number, you can change a website information that you think is important. If you can't remember which website it is, it doesn't matter.

As for the airline's registered account, you can change it by calling their service number, but it's a bit troublesome.