unlock nokia 6230i

Hello
can someone help me unlock my bt mobile
nokia6230i IMEI357082005279556 I am in
the UK any help would be much appreciated
Thank you
judav

 

#pw+426 027 040 402 637+7#

 

Thanks for trying but after I put the code in nothing happens the code
just stays on the screen

 

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