Sorry, I stand corrected. What I meant was "the My T-Mobile profile is deactivated (not deleted)"
You're quite right in saying that if your mobile number is recycled (which it more likely will be) and the previous subscriber signed up for the My T-Mobile service, then it MAY be that the profile has not been deleted, therefore restricting the new owner from signing up. In such cases, Customer Services need to pass details onto Tech Support to get the profile deleted so the new owner can sign up.
Thanks.