Who I have the same questioned this topic

WHile Tidbits information is correct, there are cases where customers were told they couldn't get the discount. 

(there was a case a few months back where the husband was wanting to switch phones with his wife, but the Edge plans would be on the wrong lines.  VWCSR told him incorrectly, both lines would lose the discount.  Not true.)

But that is wrong, and as long as you have no 2 year contract on a line, you can get the discount applied.

THe only snag is if your replacement phone is not a white listed device. 

But you are still entitled to the discount, fight for it!