NEW YORK ( The Deal) -- Spain's Telefonica SA on Monday, Aug. 26, increased its agreed offer for E-Plus, the German cellular division of Royal KPN NV, to win the backing of major KPN shareholder America Movil SAB de CV ( AMX). Telefonica, of Madrid, said it would now pay a total €8.55 billion ($11.4 billion) in cash and shares to merge E-Plus with its own German O2 cellular division, the country's No. 4 and No. 3 wireless companies, respectively. "The transaction will generate expected synergies valued between €5 billion and €5.5 billion and will make Telefonica the second largest European operator," the company said. The acquisition still faces tough questions from Germany's competition and telecommunications regulators. Both watchdogs have expressed concerns the deal would eliminate a key low-cost competitor and shrink Germany's cellular playing field to three competitors from four. The Bundesnetzagentur, the agency which awards cellular licenses, has also said E-Plus' licenses are contingent on it remaining independent. After increasing its minority stake to 29.77% last year, America Movil earlier this month launched a €7.2 billion offer for KPN. The Mexican company said it wanted to help troubled KPN get back on its feet but there was speculation that the suitor, controlled by billion Carlos Slim, was unhappy with the terms of the E-Plus sale. In the two-part E-Plus agreement, Telefonica's German Telefonica Deutschland Holding AG will first pay KPN €3.7 billion in cash as well as a 24% stake in new Telefonica Deutschland shares. Telefonica itself will then buy a 4.4% stake in the expanded Telefonica Deutschland from KPN for €1.3 billion, leaving KPN with a 20.5% stake in the expanded German cellular company. The previous agreement had Telefonica buying a bigger stake from KPN for the same amount, leaving KPN with 17.6% of Telefonica Deutschland. Telefonica said the new deal also allows it to buy an additional 2.9% Telefonica Deutschland stake to boost its investment to 65%. "America Movil has agreed with Telefonica to vote in favour of the E-Plus transaction at the improved terms at the extraordinary general meeting of shareholders of KPN," the company said.