Mexicos telecoms regulator said on Thursday it has decided who is dominant in telecommunications and broadcasting, a key ruling widely expected to impose tougher anti-trust measures on the local mobile and fixed line units of tycoon Carlos Slims America Movil as well as broadcaster Televisa. The Federal Telecommunications Institute (IFT) said it had approved the imposition of measures to boost competition that include the unbundling of the local loop for the dominant telecoms player, which it did not identify. The dominance ruling is part of a wider telecommunications and broadcast reform approved by the government.