there are grey areas in that policy. it is not very well spelled out, haven't actually seen a "once worry free exchange" policy in writing yet. went to VZW's site and read about it, it mentioned no limits.
i know this because i recently got the wife and i Blackberry Curve's when they were on the two for $20 deal......and they sucked bad..... so after a couple weeks i called up VZW and told them as much and we agreed to get the BOGO LG Ally Android phones which turned out to be much nicer.....
my wife still has her Ally and is fine with it, she is not a power user, it works for her, and she insists on a physical QWERTY keyboard...fine...but mine started going bonkers and rebooting when being used hard, etc........so i called them up, told them
here's what happened, even though i had already sent off my rebate for $100 on the Ally and even though i had already used my worry free guarantee, they allowed me to swap phones again....but instead of doing a defective swap i paid the $35 restocking fee and they sent me the new Fascinate which is leaps and bounds better than the Ally was on its best day....
the guy told me they weren't supposed to do it, but because the previous rep i spoke with who told me i could swap again documented it in her call notes, he did it. he did quote the "only one time" on the worry free exchange deal. and when i pressed him for the source....as in..."where is this stated?" he had no explanation
he even put me on hold a a few minutes to find it and couldn't and he was not new at all. he got a little crappy with me and told me he was sure it is written somewhere in the mouse type of the agreement but that he was going to bring it to his supervisor's attention that it's not anywhere easy to see...even for someone looking for it...and that they should change that
so it can happen