Welcome to CoServ Gas—providing outstanding Customer service and safe natural gas delivery to you is our privilege. This section contains important details about your rights and responsibilities as our Customer. If you have questions about your service or billing, give us a call at (940) 321-7800 or establish an online account here. If you have a natural-gas emergency, call 911. You can also contact CoServ Gas 24/7 through our toll-free emergency number, (800) 274-4014.