Default Simlock Counter Issues

Been trawling around this and other forums for an answer to something thats been bugging me for almost a week.
I have t-mobile mda i bought off a chap a week ago. I knew it wasn't sim unlocked but was ok with that. I went thru the usual lokiwiz procedure and got the unlock code. The only problem is that i get this message when i stick a sim in: You have tried 10 times. Please wait for retry.
I have had the mda on for more than 3 days and the message is still there.
The mda is a G4 wizard, and i used lokiwiz 0.3b
Any suggestions, anyone?