C Spire, formerly Cellular South, will offer the iPhone 4S, but nationwide carrier T-Mobile will not. (Tony Avelar/BLOOMBERG)

One of the country’s largest regional carriers, C Spire has been a leading voice in the fight against AT&T’s proposed takeover of T-Mobile. In a key argument against that deal, C Spire says that it is difficult for the company to get cutting-edge devices such as the iPhone on its network because of the dominance of nationwide carriers. A deal between AT&T and T-Mobile would only worsen the problem, C Spire says.

But T-Mobile, the nation’s fourth-largest nationwide carrier, was passed over for Apple’s latest handset, which is now available on Verizon, AT&T and Sprint.

C Spire declined to comment on the news apart from the product announcement posted on the company Web site. The wireless company is the largest private carrier in the United States and claims to have the highest concentration of smartphone users of any network in the nation.