Phooey. I was almost done with a reply and closed the tab so I had to start again.
Some people are perfectly satisfied receiving texts on their phones, just like in the olden days. They buy the cameras, use Auto, get regular (640 x 480) thumbnails via text and/or email, and they are happy as clams in chowder paying AT&T for cell service. They can control a limited set of settings using text messages.
You can only use the app and the portal if you pay for premium service, which costs $3-4/month depending on how many credits (months) you buy at a time. This is in addition to what you pay AT&T for cell service for the camera. You'll get one month of premium credit free when you set up your camera. Since you are going to run your camera for 6 months, you'll probably want to buy 6 credits, which I think makes the monthly cost $3.50.
2 GB data is a lot of photos. If you use large thumbnails, you'd get over 5,000 for 1 GB, and I was using day pics for my estimate. Full-size photos use more data but you probably won't request that many of those if you use large thumbnails because you'll be able to see what you need to know most of the time.
You will be able to choose large thumbnails (1280 x 960), request download of the full resolution photo, use the app or portal to change settings (a lot more settings than you can change using text messages), update firmware without ever touching the camera, etc.
Here's a chart that compares the features of Auto and Premium:https://spartancamera.com/showpost/2128
This is what the app looks like:https://spartancamera.com/showpost/2227
This is what the portal looks like:https://spartancamera.com/showpost/2229
Hope this helps. In a way it's a little complicated, but that's because it does so much. It's like anything new, you have to learn how it works. The good thing is that once you have all the pieces working together, you should be good to go. There's help available for setup. I strongly recommend that you set it up at your house for at least a week before you put it in the field even if you are very close to where the camera will be. The farther away from the camera you are, the more important that is.