When I called for a replacement, the representative would give me an order number that's a few digits off from the one I get to track my replacement phone and tells me to put the order number he gives me into the envelope. Well, I thought he made a mistake and gave me the wrong order number so I just used the tracking order number and slipped it in the envelope with the replacement phone. Turns out, the order number he gave actually has a definite purpose. Will this cause great confusion? Because I sent back the phone with the order number emailed to me to track my replacement phone instead of the one he told me. I thought it was a mistake because the two order numbers were only a few digits off. The tracking order number, when entered on the website, has my info on it and the order number he gave me didn't so that is why I thought he made a mistake and the fact that the two numbers were very similar.