** Shares of telecommunications services firm EchoStar SATS.O fall 9% to $22
** The U.S. Federal Communications Commission has told SATS' chairman Charlie Ergen it would investigate the company's compliance with federal requirements to build a nationwide 5G network, WSJ reports
** EchoStar owns the Dish Network pay-TV brand and Boost Mobile's wireless service
** SATS has spent years wiring thousands of cellphone towers to help Boost become a wireless operator, but the project has been slow-going, report says
** SATS has risen 5.6% YTD, as of last close
(Reporting by Juby Babu in Mexico City)
((Juby.Babu@thomsonreuters.com;))
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