Texans with 940 area codes will soon need to dial all 10 digits Texans with 940 area codes will soon need to dial all 10 digits (Source: Public Utility Commission of Texas) By KAUZ Team | April 7, 2021 at 3:25 PM CDT - Updated April 7 at 3:30 PM WICHITA FALLS, Texas (TNN) - Texans in several regions, including those with 940 area codes, will soon have to dial all 10 digits for local calls. The Federal Communications Commission issued an order last year that approved 988 as the three-digit abbreviated dialing code for the National Suicide Prevention Lifeline. Several Texas area codes have numbers with a 988 prefix, which means those areas must transition from seven-digit to 10-digit local dialing.