http://jjb-normal-stuff.blogspot.com/2014/07/iphone-httpsystem-security.html
The number 1-888-576-5464 is not to be trusted at this time and it is displayed in the following web popup based on this phone listing website:
http://mrn-api-external-prod-176407564.us-west-2.elb.amazonaws.com/1-888-576-5464
Refer to my link above if you can't stop this popup from taking over your browser.
