Expanding its U.S. turf, T-Mobile USA announced that it will buy SunCom Wireless Holdings for $2.4 billion in cash and assumed debt.

T-Mobile, a subsidiary of Deutsche Telekom AG, will make a cash payment of about $1.6 billion for SunCom, which operates wireless networks in the southeastern U.S. and Caribbean. The acquisition will improve T-Mobile’s network coverage in North Carolina, South Carolina, Tennessee, Georgia, Puerto Rico and the U.S. Virgin Islands, T-Mobile said in a news release.