I tried to upgrade my wife's phone today, speaking to the agent thru chat, I described the phone I would be trading in, she told me that it would qualify for the full $800 trade in discount, she then asked me for access to my account, and immediately backed off from the #$800 to $400, she said the discount was system generated, so she could do nothing about it
So it would appear , even among existing customers, Verizon has different offerings based upon whatever metric they decide to use, as a 20+ year customer, they obviously feel I'm not likely to leave, so they offer less of a deal than they do to other existing customers they fear may leave