http://www.techradar.com/news/best-antivirus-ios

Apple’s iPhones and iPads can't be affected by malware in the same way as Windows, but your devices will still be vulnerable to a host of other threats. Whether it's malicious websites, annoying ads, web trackers or just someone grabbing your device when you're not looking, there's plenty to be concerned about.

Fortunately there are lots of big-name antivirus and security vendors that can help. Installing the right app can protect you from both web-based threats and local snoopers, with powerful extras available from cloud backup to VPNs and high-end identity theft protection.