After entering the subaccount, navigate to the bottom left and click on Settings.
Click on Phone Numbers
Click on the trash icon to remove the number
Once you confirm by typing Delete below, Click on Confirm Delete
If you'd like to retain or reset the Twilio number webhooks, select "NO" here to ensure the number remains in your Twilio sub-account.
Otherwise, confirm by typing Release below and click on Confirm Release.
Once you click on NO,
Click on Add to add back the Twilio number to the account, this helps to reset the Twilio number's webhook