Your wording is a little ambiguous here. If you bought a Roger's locked phone at Apple, the lock might not be implemented until Roger signs it up for service. But if you buy a factory unlocked phone from Apple, then no it's not true that Rogers will lock it. That would be illegal.
Sorry not to be clear. I was telling him that it would be an unlocked phone and he said that Rogers had to lock it to use their system. Illegal? Quite possibly, but as said before, Rogers is evil.