Why no VoLTE when switching from Contract to BYOD?

The Android phone was bought from Videotron. I already had VoLTE activated while I was on contract. It worked perfectly fine. I was at the end of my contract and instead of getting a new phone I just kept the same phone and signed up to BYOD plan.

There is no technical barrier, it's just a policy barrier. The trick that you suggested further goes to prove that the policy makes no sense.

Hopefully, someone at Videotron can either explain why this can't be done or they can change the policy to allow compatible Android phones bought from Videotron to benefit from VoLTE.