What is adtrack.king.com? How do i get rid of it?

I've noticed this on my iphone when i use skype, I tried to reseting my phone but when i connect to my Wi-Fi it just pops up again is it a harmful virus? If so how do i get rid of it?

Malware on smartphone are new and king.com is a valid website. Can you please take screenshot or screen capture of that message?