From Silent Circle:

Russian authorities have openly acknowledged that widespread monitoring of phone, Internet and other communications systems is in place during the games and have framed these measures as part of overall security preparedness. Safety and security aside, this degree of persistent surveillance creates severe risks for visitors worried about sensitive personal and business communications being compromised when they keep in touch with colleagues and others from Sochi. There have been a number of stories over the past week warning that visitors and athletes can expect to be hacked, noting “it isn’t a mater of ‘if,” but a matter of ‘when.’”