I am also constantly getting this same error - Source Connection Error: "One or more of th iCamSources returned by the iCam Broker Server could not be connected to" over 3G AT&T. I even get this error even when ATT&T has five bars and other apps are streaming fine. I searched the web and I was told to try the stocks app on the iphone before trying icam. I did this and it worked once out of 50 tries.
It will be helpful if you can post the solution to these issues on the forum instead of email support - so other users dont go through the same - though I agree in some cases email support is warranted.
I am having a tough time getting it to work over 3g - i travel to work a lot, but cannot get it to work, almost anywhere i try.