The iPhone has landed today on another regional wireless network in the United States, bringing a total number of iPhone-friendly carriers in the country to thirteen.

According to Oklahoma-based Pioneer Cellular, today they began offering the iPhone 4S in five company-owned stores.

Additionally, Apple’s smartphone will hit other Pioneer retail stores on May 29, June 4, June 11 and June 18…

9to5Mac first reported on Pioneer Cellular getting the iPhone 4S today.

Pioneer Cellular is a CDMA-based carrier headquartered in Oklahoma. They recently acquired the assets of GSM provider CellularOne in five Oklahoma counties that used to be the former home area of Dobson Cellular.

Here’s Pioneer’s complete iPhone availability list, also available as a PDF document on their website.

Pioneer Cellular, which covers most of Northwest Oklahoma, did not reveal pricing at press time. Most other regional carriers offer the iPhone 4S with a $50 discount, priced at $149 with a two-year service agreement.

Pioneer’s smartphone data plans start at $30 a month.

For more information on availability and sales terms, visit Pioneer’s website.

Pioneer’s announcement brings total number of U.S. carriers that offer Apple’s device to thirteen.

Here’s the complete list.

  • Pioneer Cellular
  • Bluegrass Cellular
  • Golden State Cellular
  • Nex-Tech Wireless
  • CSpire
  • nTelos
  • Alaska Communications
  • Appalachian Wireless
  • GCI
  • Cellcom
  • Verizon Wireless
  • Sprint
  • AT&T

Earlier this month, three regional carriers in the U.S. announced iPhone availability: Bluegrass Cellular, Golden State Cellular and Nex-Tech Wireless.

April also saw the iPhone expand to nTelosAlaska Communications and other regional carriers.

If you happen to live in Northwest Oklahoma, we’d be please to hear about your experience with Pioneer Cellular down in the comments.