FILE PHOTO - The logo of America Movil is pictured on the wall of a reception area in the company's corporate offices in Mexico City, Mexico, May 18, 2017. REUTERS/Edgard Garrido/File Photo

MEXICO CITY (Reuters) - Mexico’s telecommunications regulator IFT on Thursday asked billionaire Carlos Slim’s company America Movil to modify a proposal to separate out its fixed-line services, the regulator said in a statement.