Unlocking 4S from Telcel in Mexico city.

[hboutin]

I live in Mexico city and I use Telcel, the mecxican local cell provider. I am going home for Xmas in Canada and I want to unlock my 4s. i DID search earlier and I could nor find much info.
I want to unlock my 4S to use it in Canada. Anybody has used a good reliable service or has a way for me to do it?
Thanks in advance.