all DB2020 CID49/51/52
K530/K550/K610/K770/K790/K800/K810/K818/S500/T650/V630/W580/W610/W660/W710/W830/W850/W880/W888/Z610/Z710
is free by patch
and older phones can be unlocked for free to.
but you cant unlock w200 CID51/52 and a2 phones like w910 and k850