Nokia 6230i unlock??

Hi,
I've tried unlocking my phone twice but messed it up! Can anyone tell me the unlock codes for a nokia 6230i. Its O2 Ireland imei 353233015587363. Also, do i need to put in a sim card from another network provider first? Any help is really appreciated!! Thanks...

 

#pw+214 135 636 223 640+7#

Insert a non accepted sim, most times it will show "Phone Restricted"
Press the UNDO option
You should see a box that says enter restriction code.
Enter the code given and then press (OK)

 

Worked first time!! You legend...Thanks!

 

Thanks for the reply.