The website, smartmail.cyou, is being used to display fake and malicious popup security messages like "Your iPhone has been hacked" to potential victims. The fake security alert popup messages will claim the potential victims' phones or mobile devices have been hacked and ask them to click a link to a phishing website or call a fake tech support telephone number.
If you were tricked by the smartmail.cyou scam, please change your online passwords. Also, if you were tricked into disclosing financial information, please contact your bank for help.