That dummy ESN didn't work for me, so I just went ahead and tried switching between the two phones without moving one line away first - it worked on the website with the first line but I couldn't activate the phone because I guess I ended up with two lines on one ESN. I suppose that was to be expected! Perhaps I could have gone ahead and moved one line off to the old phone, but at that point I started to get a little worried about having two unusable phones and/or lost numbers, so I just called verizon.
The rep was very nice and walked me through swapping the two phones. No mention of a charge, so I guess I lucked out (or I will see it on my bill).
When I asked, the rep confirmed that a third, unused vzw phone (as mentioned here) is the easiest way to do this. Hopefully the next time I do this I will actually have one available!
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