I have a Koodo phone I was duped into getting to try to help someone who then took advantage of me. If I sell it to a Telus customer, do they still have to unlock the phone to use it through Telus, even though Telus owns Koodo?
These days, generally they shouldn't have to. I've used (and currently still am) using an HTC M8 from Koodo with my Telus plan. I've also used a Koodo Moto G, Desire 601, Z10, and S4 mini all with Telus just fine without unlocking.