On September 8, 2009, US Congress issued a letter to the Department of Homeland Security (DHS) and the Federal Communications Commission (FCC) urging DHS and the FCC to consider extending radio EAS information to the American public via mobile phone handsets. FCC Chairman Genachowski issued a reply letter to Congress on March 18, 2010. In that letter Chairman Genachowski stated.....

As you may be aware, on April 9, 2008, the Commission released its First Report and Order adopting technologically neutral rules for the CMAS. In that Order, the Commission considered the comments filed by supporters of FM-based emergency alert technologies, and ultimately concluded that it would “not require or prohibit the use of ALERT-FM . . . or similar systems as the basis of the CMAS.” CMAS participants, then, are free to adopt FM-based technologies as they desire.
 

The complete letter can be seen below.......

 http://fjallfoss.fcc.gov/ecfs/document/view?id=7020400159

http://fjallfoss.fcc.gov/ecfs/document/view?id=7020400152