Michigan Compiled Laws, Chapter 484. Telephone, Telegraph and Radio § 484.2358

Sec. 358. (1) As used in this section, “number portability” means the capability for a local exchange customer at a particular location to change providers of basic local exchange service without any change in the local exchange customer's telephone number, while preserving the full range of functionality that the customer could obtain by changing telephone numbers.

(2) A provider of basic local exchange service shall provide number portability. The commission shall, consistent with federal law, enforce number portability, number administration, number reclamation, and number assignment between regulated and unregulated providers.