Release a phone number in AWS End User Messaging SMS
If you don't need a phone number that you had previously requested through AWS End User Messaging SMS anymore, you can release it from your AWS End User Messaging SMS account. When you release a number, AWS stops charging you for it in your bill for the next calendar month.
Important
Releasing a phone number from your AWS End User Messaging SMS account is permanent and can't be undone. If you release a phone number, you won't be able to obtain the same number again in the future.
Deletion protection has to be disabled before you can release a phone number. For more information on deletion protection, see Using phone number deletion protection in AWS End User Messaging SMS.