This is good, but very open to abuse
What is to stop a carrier from starting to black-list phones from closed accounts just because.
Unpaid bills, for a stolen database, is not its purpose. I know of cell phones that had previous unpaid bills, (I don't remember the provider, believe it was Sprint), bills got paid, but the phone was never removed from the Do-Not-Authorize list.
If anybody (carriers) can add a phone to the database, who can have serial numbers (I use serial for both IMEI and ESN) removed from this database.
Yes, this is a great idea, as long as it is used for it's intended purpose only.
Yes, I am not employed and looking for IT work. Have passport, will travel.