Apple plans to expand its potential customer base┬álater this month when the fifth generation iPhone makes its debut on a number of regional CDMA wireless networks here in the United States. The launch will add to Apple’s regional carrier partnerships that began last October with wireless carrier C Spire.

As mentioned by MacRumors, five regional carriers across the United States have announced plans to offer customers the iPhone 4S beginning April 20. nTelos Wireless in Virginia, Alaska Communications and GCI in Alaska, Appalachian Wireless in Kentucky, and Cellcom in Wisconsin will reportedly take on the iPhone later this month.

Regional carriers allow Apple to expand beyond large cities covered by major networks, including AT&T and Verizon. National carriers do not necessarily offer coverage to those in more rural areas, often leaving many with few smartphone choices.

Now, instead of partnering with another national carrier like T-Mobile or Cricket, Apple can reach several markets otherwise inaccessible.