Telus, in response to learning customers were unlocking Telus cell phones, decided they would stop it by telling their suppliers they wanted un-lockable phones from here on out. Result? Look where the SIM from another carrier would fit - there is NO SLOT! Now get this: You bought the phone, but you don't actually own it! It's analogous to buying a TV and it will only work with a specified cable co. etc.
This is theft, pure and simple theft.
And, how about if you get the phone cheap or for 'nothing' with a contract, of course. When your contract is up, do they reduce your monthly bill by the amount included to pay for the phone? Do they hell! They will if you call and threaten to leave... I'd leave anyway...
Never, ever, buy a cell phone that is locked and sealed from SIM-card changes! If they don't have 'em, go to one who does. Or get it un-locked if it is un-lockable - ask and/or check inside (behind the battery) and look for a SIM-card slot.
I am now with Mobilicity having taken my own un-locked (purchased in the UK, but you can one at an independent phone phone store.) Just check it uses your intended provider's signal. i.e. G3, GMS etc. Ask the store...