In a Style Plus story yesterday, GTE/Sprint was omitted inadvertently as one of the sponsors of the TeleConsumer Hotline.

For help in evaluating your long distance needs:

*Center for the Study of Services (Washington Consumer Checkbook): Publishes The Complete Guide to Lower Phone Costs ($6.95, including postage), a 72-page book that compares cost, service quality and service features of each of the major long distance carriers. Shows how the carriers' charges would compare for 72 illustrative callers, each with a different calling pattern. Available from Lower Phone Costs, 806 15th St. NW, Suite 925, Washington, D.C. 20005. Center also offers Computerized Long Distance Cost Comparison Service. For a fee that ranges from $10 to $75, depending on the size of your phone bill, this service will analyze a recent month's phone bill and tell you how much you would have paid using various long distance carriers available to you. For more information: (202) 347-7283.

*The Telecommunications Research and Action Center (TRAC): Consumer group offering an analysis (for $35). Compares rates of eight largest long distance companies. TRAC also publishes a simple, easy to read long distance comparison chart of 16 different features of the eight largest long distance companies. Chart updated regularly. Available for $1 and a self-addressed, stamped envelope. TRAC Chart, P.O. Box 12038, Washington, D.C. 20005.

*TeleDoll by Suresoft, McLean, Va.: Computer software for your IBM-PC, or compatible, with at least 256k memory. Software analyzes your phone bills on your own computer. Single disk program ($30) is the same system that TRAC uses for its comparison service. Available through Suresoft, (703) 356-9309, and TRAC.

*TeleConsumer Hotline: Live counselors 9 a.m. to 5 p.m. Monday through Friday. Service founded by the Consumer Federation of America and the Telecommunications Research and Action Center. Supported by grants from Bell Atlantic, Southwestern Bell, Bell South, Mountain Bell, AT&T, Allnet and SBS Skyline. 1-800-332-1124 in Maryland or Virginia and 483-4100 in the District.