T Mobile Insider Code
Webcheck the status of your exclusive code. To begin, simply enter the exclusive code you were provided. If you do not know your exclusive code, click here. Webinsider code(promo code) is a 20% discount to your phone bill. You would have to ask a tmobile employee if they have any to spare.
Webgo to a store and tell the rep that you want to switch carriers and how many lines you have. I wouldn't switch until i get an insider code. And don't fall for the:
