Blackberry Curve 9300 all networks no scratches good battery !

crome blackberry curve good condition opnly used a couple of times and simm free 60.00 or nearest office cable and charger included please call after 11am Blackberry Bold 9900, i bought this phone and did work the guy said it was on tesco, i put a o2 sim in it also and that worked fine aswell as a tesco sim, the next time i switched the phone on it says at the top no " phone not allowed mm6" so i persum this phone has been blocked