Tex. Utilities Code § 56.208

(a) In determining which nominated telecommunications provider the commission will designate to provide service to the petitioning premises, the commission shall consider the relative estimated cost to be incurred by contiguous providers to serve the petitioning premises and give preference to the provider having the least cost technology that meets the quality of service standards prescribed by the commission applicable to that provider.

(b) The commission may not designate a telecommunications provider to serve the petitioning premises unless the premises are located in an area that is contiguous to an area in which the telecommunications provider has previously been designated eligible to receive universal service funding under Section 56.023(b). This subsection does not apply if the commission designates the provider after the provider voluntarily agrees to provide service to the petitioning premises.