Gulf Coast Wireless is seeking to block the proposed merger of Sprint and Nextel, becoming the fourth Sprint affiliate to take such action.

Gulf Coast is based in Louisiana.

Sprint has settled with one affiliate, US Unwired, by agreeing to buying that company.

Other affiliates suing Sprint are Ubiqui Tel and iPCS, according to media reports.

Sprint and Nextel hope to merge later this summer in a deal worth some $36 billion.