Here is where my idea comes in.
1. Choose up to as many lines as you need.
2. Choose all basic phones.
3. Get the max amount of data for the carrier you're going to switch to or are on.
4. Change the amount of data you want later on, and so on.
Then, this is where it gets a little confusing. So, bare with me guys!
You would get today's "basic sim". They have changed, but I am taking about a SIM for a flip phone of some sort. I am aware that some phones are sim free, but I know that some that do require some sort of sim card. You somehow ask to get 1,2,3,4,5,6 GB's of data on THAT basic sim. Now, I don't know how you would enable 4G/LTE on there, because it looks like they are incompatible. Somehow, someone could enable 4G on those basic sims, SOMEHOW. Then, cut it depending on what smartphone you want and bam. Save $10-20$ per phone. The fact that the carrier "knows" you're going to want a plan that involves one or more smartphones, bumps up your bill. I honestly don't think basic sims even support 3g, but with this day and technology, anything is possible. Anyone have any kind of idea of what I am saying?