Where can i get a Sony ericsson w810i unlocked

Hi,

Turned my phone on this morning and it was saying no sim, took it to the shop and they said the sim was burned out and gave me a new one. Put that one in and the phone now says "Phone locked", i've tried all the standard codes 0000,00000,12345. Are there any more?

If not where would i go in dublin to get this unlocked?

Thanks

I just emailed O2 and they unlocked it for me. I'm pay as you go.