Hi, My wife is opening up a wireless accessory shop, my background is of a mobile developer for Android and IOS. At any rate It looks like the biggest pre paid carriers in our area are metropcs, boost , simple and H20, I actually use SIMple and my uses H20 on our phones My question is can any one point me to a resource that would explain some of this business. What the difference between master agents are and why we must go through them. Also what are the most profitable dealership. I am extremely interested in residuals.