I know this is an old post but I thought I would provide some up-to-date information about the APN settings required in order to be able to access the internet/use MMS on Fido's network when using an unlocked device in case anyone else were to have a similar question.
The APN settings are the following:
MMS (Picture & Video Messaging Settings):
Leave the following fields blank: Proxy, Port, User Name, Password, Server.
Once you have programmed these settings in your device, you will be able to access the internet and/or use MMS.
Hope this helps!