unfortunately i cannot speak for verizon BUT... for sprint, all that plan manages is billing. the network does not care what device you have, only the billing system does. so if your carrier has a way to get around the error they get when they add the plan in the billing system that may say it is not capable. Then you can have that plan and have the same access. your esn tells the network how to provision your connection, all the plan handles his how much money shows up on your bill. It is no problem for people who have OLD Vision plans that were free cause 2.5G access was new, and now on 3G EVDO and they are on the same plan cause the the rep knew how to get around the error when in fact were supposed to tell the customer that they need to upgrade plans to get EVDO service.
also, #777 is what is called a packet dial string. on Qualcom chipsets for CDMA, when the phone is passed that string (PDA, Java Clam, Brew Clam), it knows to initiate a data connection. your device can use dialup numbers (e.g. aol) and it would technically work but that would be using the original wireless web connectivity of 14.4kbps and charged by the minute regardless of plan. This is true for all CDMA carrier in the US.
sorry, no verizon news. lol