Use a browser (e.g., Chrome, Firefox, Safari, Duck Duck Go), not the app, to log in to your account at spartancamera.com.
On the Camera Management page, open the menu then choose Shop.
Choose Data Service.
Type your camera's IMEI in the space provided. It's on a sticker on the top of the camera's screen and on the box the camera came in. Then tap/click Go.
Select the wireless plan by clicking the drop-down arrow to view the available plans (which are the same for both AT&T and Verizon), then choose your plan. This example shows selecting the 1 G data for 3 months for $35.99.
Once you've selected your plan, as shown in the screen shot below, scroll down and read the plan details.
Check that you have read and understood the plan details, then tap/click Verify ICCID.
Add the plan to your cart.
If this is the only data plan you need, check out. If it isn't, then add a plan for each additional camera then check out.
If this is your first camera, you will need to enter credit card information. Once you do that, continue with the checkout process. You will be asked to confirm your credit card information more than once so make sure that you do so. Do not exit without completing the checkout process or you will not have purchased a data plan.
After you have checked out, you will receive a receipt email and also an activation email. Once you receive the activation email, you are ready to add your camera to your account and continue setting it up.