Is Virus possibilities for Iphone (Mac OS)?

Guys recently I've purchased Iphone. So please let me confirm Whether by the usage of WI-FI does virus possibilities are there? Or Iphone Mac Operating System is free from Virus.
If there are virus possibilities what steps do i need to follow? Does it requires any sort of Anti Virus Protection?

You're lucky because Apple devices don't get viruses

Mac may infect with virus but rarely occurs. If you own a Mac computer, you can use Magican to detect virus.
You can free download it from: http://www.magicansoft.com