IPhone 5s virus or not?
Hello, there's nothing that you should worry about. What you've experienced is not a virus but an advertisement only. Companies use that kind of advertising technique to get your attention and will force you to click on their ad. The fact that they said "Android" and you're using iOS already sound fishy.
IPhone 5s virus or not?
Hello,
when surfing on internet sometimes we came across such warnings as you said. You should have the updated anti-virus on your mobile to prevent your mobile from such events. As you have already deleted all your information and apps no need to do it again in future. When such situations occurs just exit from such web pages. First check all your mobile functionality doing well and no issues occurring so no need to concerned about it. It may be threat so best thing we can do is always keep the anti-virus updated on mobile.