How to make P168c work on T-mobile SIM Card?

Ok, well I just got my new p168c (wanna be iphone) and I put my Sim card into slot and it acts like it can't read it, yet it knows its there by showing signal on the slot. I called T-Mobile about the problem and they said it won't work because it T-Mobile doesnt support iphones. Yet it says it works with anything. Even T-Mobile and i seen it work before from the Youtube Videos. So I don't know if I just just return it or what. The phone is not that bad. How can I make the Phone read the T-Mobile Sim Card?