We have the largest database of "how to enter code" in the world, improved over 5 years now..! Please check :
http://www.unlockbase.com/faq/en/ <- in english
http://www.unlockbase.com/faq/fr/ <- in french
If you don't find your phone model there, please post it below and we'll ask the factory or the network provider to keep this database up to date !