Don't try to cut the SIM into a micro-sim yourself. That's the mistake i made and ended up with a useless SIM. You need a micro sim like one shown on this blog (second one, on the right) i.e. sim metal contacts should be towards right instead of center

http://theidealmobile.blogspot.com/2...ork-error.html

Had to ultimately go to a T-Mo store to get a new micro sim for 20$, they activated it in the store.