How do I unlock my iphone to use with my tmobile service?

I bought an iphone from a used phone salesman- however, it is NOT unlocked. I'm very illiterate on the iphones- as I have never used one. The only details I have for you is that I followed t-mobiles instructions and did a master reset on the phone. When it is turned on, it now has the slide to unlock it and then goes to a keypad and asks for an emergency call only. Then goes back to the screen that says to insert a valid sim with NO pinlock to activate Iphone. hmmmm.. HELP pleaseeeeee :) Thanks- M
 
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