Not very well up on phones but I bought one second hand, all is well,works fine and I've got Â£17 in credit. Thing is the previous owner put a password on and it locks out any attempt to set a security code etc. I was told to change the sim so I did to Tesco but it still says Network lock out. what happens now?I'm happy to stay with Orange but I wanted a security code and I know you can get them unlocked but the firms on the net want a few quid and although I don't mind that I'm not putting credit card details on their websites. Phone is a Samsung,any one know how to proceed?thanks if you can steer me the right way.