How to remove the blacklist of mobile phones?

There are two ways to become a blacklist of mobile phones:

1: mass spam messages.

2. More than three numbers have been processed for the same ID card, all of which are in arrears, but the account has not been cleared.

The solution of blacklist:

The first case: write a guarantee that you will not send spam messages. If you are detected to send spam messages again, take a copy of your ID card at your own risk.

The second case: pay the arrears and cancel the account.