They only support 4 cameras right now. However, you could set up 4 instances of icamsource with one username/password, and then run 2 more instances with a different username/password. The problem is that you would only get push notification for the account that you are currently logged into as on your iPhone. Make sense? Not very convenient. If your phone is jailbroken, it might (?) be possible to install the iCam app twice....and login with each username with each iCam app. I've never researched that, so I don't know if it's possible to run 2 instances of the iCam app on your phone.