América Móvil said on Thursday that Mexico's telecommunications regulator had decided that its Mexican fixed-line company had not broken any rules by running an online TV news platform.
Mexican regulators last year began a probe into whether América Móvil's fixed-line unit Telmex violated the terms of its concession, which bars it from transmitting television, with its online television and news website "Uno TV."
América Móvil is owned by the family of billionaire Carlos Slim and was subject to a sweeping sector reform passed in 2014 which sought to loosen its dominance of telecoms in Mexico.
Slim's company, Latin America's biggest mobile phone and pay TV provider, has long been angling to offer television services at home.
"Uno TV" was launched in 2008 to offer television content via the internet, sparking a debate over how it should be regulated and whether it broke América Móvil's concession terms.
América Móvil stock was trading down 1 percent on Thursday.
Mexico's Federal Telecommunications Institute (IFT) is carrying out a separate probe over whether América Móvil broke the law in its relationship with satellite TV provider Dish Mexico.
Competitors complained that América Móvil's relationship with Dish - the two companies printed a single bill for shared services - violated Telmex's concession.
