Hutchison Whampoa is close to announcing a $15 billion acquisition of U.K. mobile operator O2, a move that would help reshape the U.K. mobile market vaulting Three, Hutchison’s U.K. mobile operation up to the top of the market, in terms of revenue market share.

If the acquisition is approved, Three would have about 38 percent revenue share, possibly reaching the top spot for revenue share in the U.K. market.