What's the best wifi monitoring camera that can be used with an iPhone?

[Richard]

I use a Foscam FI8910W. This supports Ethernet and WiFi connection to my router (I use WiFi). I can connect to the camera when I am away from home using my smart phone. It has infra-red night lights, can be remotely turned left and right and up and down. It can email images and uses a motion detector to trigger the sending of an email. It also supports DDNS through such a service offered by the manufacturer.

You have to set up port forwarding through your router if you want to access the camera from the Internet.

Mine is an indoor model, but Foscam also make weatherproof versions.

I hope this helps.