I'm shopping for IP cameras and I have questions.

There are several of us doing what you want to do Most are using a hot spot in the rig. I actually got an AT&T Unite with a static IP to accomplish this but it was a long process and you need to have your phones on a business account. It was pointed out to me that the "Cloudcam" from the 3G store does not require a static IP to be routed through a personal hot spot so you might want to check that product out. It CAN be done with a little research. Good luck.