Why do toll-free phone companies require a bill copy to transfer your 800 number?

If you currently control your own 1-800 toll free phone number (or 888/877/866) and choose to transfer your toll free number to another company (also called ‘porting your number’) the company you are  ransferring it to will require a bill copy, but why? The answer is simple; it’s for the security of three entities: 1. [...]

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