French telecoms operator Iliad has made a $15 billion cash offer to purchase 56.6 percent of T-Mobile USA, the No. 4 U.S. mobile provider, an unexpected move that counters an earlier merger proposal by Sprint.
T-Mobile confirmed to CNBC that it received a proposal from Iliad, but said it had no further comment on the matter at this time.
Iliad submitted the bid to T-Mobile's board of directors and said it is working with leading international banks to secure financing for the deal.
"The U.S. mobile market is large and attractive," Iliad said in a statement. "T-Mobile US has successfully established a disruptive position, which in many ways, is similar to the one Iliad has built in France."