Yes, if you bought the device in full from the manufacturer, they have to provide the OEM unlocking codes.

It voids certain warranties and puts a stain on your baseband modem. Meaning if you're going to do this, hook your phone up to a carrier before unlocking it. This way your access to that carrier isn't blocked when you do the unlocking. Otherwise they can just not accept your phone, and you're left with a wifi-only burner phone.