The popular Android only app has unofficially been ported to iOS through a 3rd party app store. This is a free app and works exactly how the Android app does. Follow these steps to get it. You DO NOT need to be jailbroken.
Step 1: Open Safari on your iDevice
Step 2: Type in this url in Safari: emu4ios.weebly.com/downloads
Step 3: Scroll down until you find "Ingress" and hit "Install"
Step 4: Now allow it to download to your homescreen
That's it, Now you have the Android app on your iPhone, iPad, or iPod.