Wallaby not recognising SIMs

[chicago]

I have an old Wallaby which I used (on O2 network) before I was given a mobile at work.

I've started to miss the facilities - so I've followed the instructions to remove SIMlock (uploaded xda-developers operating system).

Although I'm being told the phone is no longer simlocked it will not recognise SIM cards (even an 02 card from my wife's phone).

Getting a message to insert SIM and type in PIN number.

Any ideas???

Regards
Chicago

[cruisin-thru]

Is it asking for pin or sid code, mamy sims come with a lock, I think O2 use 5555 as the default code. If it asks for sid the phone is still locked.