Tex. Utilities Code § 53.304

(a) An incumbent local exchange company may offer an extended local calling service, a packaged service, or a new or promotional service on an optional basis or make a minor change in its rates or tariffs if the company:

(1) is a cooperative corporation or has, together with all affiliated incumbent local exchange companies, fewer than 31,000 access lines in service in this state;

(2) files with the commission and the office notice, as prescribed by Subsection (b), not later than the 10th day before the effective date of the proposed change;

(3) provides notice as prescribed by Section 53.305; and

(4) files with the commission affidavits verifying that notice as prescribed by Section 53.305 was provided.

(b) The notice must include:

(1) a copy of a resolution adopted by the incumbent local exchange company's board of directors approving the proposed change;

(2) a description of the services affected by the proposed change;

(3) a copy of the proposed tariff for the affected service;

(4) a copy of the customer notice required by Subsection (a)(3);

(5) the number of access lines the company and each affiliate have in service in this state; and

(6) the amount by which the company's total regulated intrastate gross annual revenues will increase or decrease as a result of the proposed change.