When you release a number, Twilio reserves that number for your project for 10 days in case you need it back. After 10 days, the number moves to the next phase of its lifecycle, where it undergoes a series of traffic and capability tests. This ensures that the phone numbers are clean and have as little traffic as possible before they're made publicly available.

The console allows you to recover numbers that you have released in the last 10 days. Release numbers will show up on Console's Released Numbers page. Simply click on the Repurchase Number button to make the number available again for your project.

Note that the action is considered to be repurchasing the phone number, so you'll be charged for the monthly fee upon performing the action. In addition, the restored phone number will be given a new Phone Number Sid. Make sure you update the record in your application before accessing the phone number resource.

If you don't see numbers you wish to restore anymore on the Released Numbers page, please contact support for help.