I 611'ed AT&T about upgrading to the NL920 from my NL900. The initial customer representative said I wasn't eligible until Nov. '13. I asked to speak to a manager, who processed a Cyan NL920 for $99 (w/ interest came to $108+change) hassle-free. It couldn't have been an easier process.
I explained how online I was only being offered an early upgrade for the iPhone. And I wasn't sure if saying any of this stuff worked to my advantage, but I mentioned how I have been a loyal customer since Nov. '08 when i got my iPhone 3G; The 900 isn't eligible for WP8 software. The first guy I spoke to was obstinate, but the lady manager couldn't have been more accommodating.
I was so excited getting the 920 for $99, I forgot to ask about the charging plate. Not that I care really: It's my understanding it charges slower than a direct plugin anyway. The phone is backordered, unfortunately, so I don't know when I'll be receiving it. Either way, I feel taken care of.
I was ready to pull the $499 trigger on Microsoft's web store and would have except I wouldn't pay that much for a phone I'm not certain is unlocked. Luckily, I did not have to.
Thank you, AT&T!
EDIT: In addition, I didn't even bother *****footing with some song & dance to the manager, I flat out told her I read about people in my position getting the phone for the $99 price tag on WPCentral. Only having the 900 for 7 months, I wouldn't have even asked about an early upgrade if not for what I was reading on here.