France Telecom offered to buy the shares at 245 Egyptian pounds apiece. The offer, which ends January 14, could cost the French telecoms company $2.9 billion if all shareholders agreed to sell.
Mobinil, formally known as the Egyptian Company for Mobile Services (ECMS), has been the subject of a long battle for control between its two main shareholders, Orascom Telecom and France Telecom, neither of which has a majority stake.
Orascom had filed an appeal against Egypt's regulator's approval of France Telecom's bid. Orascom is arguing that France Telecom should have offered 273 pounds per share, equivalent to a price set by an arbitration court last April for the Mobinil shares Orascom held through a holding company.
But France Telecom had said it had no intention of raising its offered price