21453: Phone number already validated on another account

You attempted to verify your phone number to activate your Twilio Free Trial Account, but that phone number is already associated with another Free Trial Account.

A single verified tester number can be associated with a maximum of 3 accounts globally. The phone number you are trying to verify has already reached this limit.

• Use a different phone number to verify your account.
• See Verified recipients for details on trial verification limits.