As of May 15, 2014, the 4 largest wireless carriers (AT&T, Verizon, Sprint and T-Mobile) have voluntarily made available text-to-9-1-1 upon request by the Public Safety Answering Points (PSAPs). The Texas Commission on State Emergency Communications (CSEC) has adopted policies and instructions for the implementation of text to 9-1-1 to ensure consistency in implementation. The 9-1-1 Regions will be responsible for requesting and implementing text in the 350 PSAPs in the CSEC program administered by the Regional Planning Commissions (RPCs).
The recently adopted policies and instructions for the Regional Planning Commission (RPC) 9-1-1 Programs are available in the Program Policy Statement section at this hyperlink. Please refer to PPS 036: Text to 9-1-1, located at the bottom of that page.
The FCC is updating information as counties and PSAPs add Text to 9-1-1 services. You can find more information on their website by clicking here.