I'll repeat what Kappy said (almost 2 years ago) so you understand it.
There are no know viruses that can affect an iPhone that has not been jailbroken, period.
The message you are seeing has nothing to do with a virus.
This is an issue directly related to the website you are visiting, by the looks of it Verizon Wireless. You can try clearing the Safari cache, by going into Settings->Safari->Clear History and Website Data. Then close Safari, by double clicking the home button, and swiping the screen shot up and off the screen.
Open Safari, and try again.
And I will say it one more time, It is not a virus. There are no known viruses that can affect non-jailbroken iPhones.