SIM Card not Valid?

[Active Lad]

I have a Nokia 6600 on Orange Contract and got an Unlock Code from this site :D . The code was accepted "SIM Restriction Off" but when I insert an O2 PAYG SIM, I get a "SIM Card Not Valid" message. The phone still works fine with the Orange SIM. Is there any explanation for this?

[muppetman]

Phone is blacklisted/BARRED or usually that means that u have unlocked the network lock but your phone has still active second (sim) lock…
So run calculator once again and try to enter +5 code and your phone will be totally unlocked coz Orange use 2 locks.

[Active Lad]

Phone is blacklisted/BARRED or usually that means that u have unlocked the network lock but your phone has still active second (sim) lock…
So run calculator once again and try to enter +5 code and your phone will be totally unlocked coz Orange use 2 locks.How sneaky! :-D :eek: Still, your advice was spot on and I'm now connected to O2. Many Thanks MM :D