In addition to Bluegrass Cellular, Golden State Cellular ( and Next-Tech Wireless ( announced they’ll offer iPhone 4S to customers beginning Friday, May 18.

Golden State Cellular is based in central California. Next-Tech Wireless — a subsidiary of Rural Telephone, Golden Belt Telephone and Mutual Telephone — is a wireless provider offering wireless solutions to residents in 40 counties of central and western Kansas as well as local coverage to four counties in Colorado.

Both will offer the iPhone at US$50 below the standard pricing available through Apple and the major carriers. Under the discounted pricing, the iPhone 4S will be priced at $149/$249/$349 and the iPhone 4 will be available for $49.