Miss. Code Ann. § 77-9-701

Every telegraph company shall establish and maintain offices for the transaction of business with the public in its capacity as a common carrier, at each city, town, and village convenient to its routes, if, in the opinion of the public service commission, the public convenience and necessity requires it. An office once established shall not be discontinued without the consent of the commission, which has authority to require such a company to establish and maintain offices. The commission has authority to require telegraph companies to keep night operators at every place where, in its judgment, the business and the public convenience justify and require it.