NEW YORK (TheStreet) -- T-Mobile US (TMUS) - Get Report gained 6.5% to $32.95 Thursday after French telecom Iliad offered to buy a 56.6% stake of the company.

Iliad offered to pay $15 billion in cash for the 56.6% stake as a price of $33 a share. The company values the remaining T-Mobile stock at $40.50 a share. The offer is counter to any bid that Sprint (S) - Get Report was preparing to make for the carrier.

Iliad views its T-Mobile bid as a "one-time opportunity to enter the world's-largest telecoms market," a source told The Wall Street Journal.

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