So, if you have already tried a plan and find it doesn't work for what you need, you can pay the difference to upgrade to the next level plan?
I have an app I use that I use to keep tabs on my business... I really only need to refresh it maybe once or twice a day, just to be sure a message isn't missed from a customer or a vendor. Most of the time everything is clear and I'm back to my Drink of the Day within about 30 seconds. It doesn't use much data at all... unless there is a problem that I need to deal with, I've been able to make the 50mb free plan last for an entire 7 night sailing (when there is a problem, that 50mb disappears in an instant). I hate to pay $10 a day for just a minute or two a day, but I'd hate to pay $20 for it even more. The basic plan might just work without a problem, but I'd be stunned if the app would be on an approved list. If I can't use the app on the basic plan, it would force me up into the next tier just so that I could refresh it. The first time the new plans are available to me, I'll try the basic first and cross my fingers.