How to register my unlocked iPhone to a new carrier?

I just received a second hand iPhone, and I'm going to get it unlocked sometime this week. This phone was previously linked to Rogers as its carrier and I'm hoping I would be able to change it to telus. Once I unlock it, would it be compatible with telus or would I have to do something else as well?
Any help provided would be awesome!

I think all you would have to do is get a Telus SIM card and put it in the phone.

I'm not Canadian though, so it might be a good idea to check with Telus ahead of time and ask them: "If I have an unlocked Rogers iPhone, will it work with a Telus SIM card?"