The situation. I am currently on the Cricket network. I pay $48 a month and get unlimited text, voice and data all day everyday. I bought an iphone and love it. I want to use it but cant afford the At&T plan. I hear that it is possible to plug in a t-mobile sim card and use the t-mobile plan on an i-phone? The solution. Go to the store. Buy a t-mobile plan and a free phone. Sell the phone online and get some beer money. Plug simcard in the iphone and talk away. The problem --> Is it possible?