The Federal Communications Commission has approved the purchase of SunCom Wireless by T-Mobile USA, the companies said Monday. FCC approval was the last regulatory hurdle for the deal, which is expected to close by the end of this month, the companies said. "Combining the strength of T-Mobile's national network, top-ranked customer service and rich personal communications products and services is an added benefit to the more than one million customers served by SunCom," Robert Dotson, president and CEO of T-Mobile USA, said in a written statement. "We very much appreciate the FCC's speedy approval of this transaction." T-Mobile, a subsidiary of Deutsche Telekom (NYSE: DT) of Germany, is paying $2.4 billion to buy SunCom's shares and outstanding debt. Its purchase allows the company to move into North Carolina, an area where it currently doesn't have a network.