Yes, your camera(s) will continue to work until your Overage Tolerance is met. Once your Overage Tolerance is met, the camera(s) will be suspended. To view your Overage Tolerance, launch your Scoutek app, open the menu and navigate to the My Account section. Then, open menu and select Account Options.
Also, you will be billed for all overages at $0.15 for each 1 MB, rounded up. For example, if you use 10 MB over your allowance, you will be billed an additional $1.50.
Keep in mind, you can upgrade your data plan to avoid overages and simply pay the difference in the price of the two plans.
For more information, view this video: Suspend vs Deactivate