Upgrade to Iphone 4S (preorder) online using another upgrade

Question

Hello, I have read other peoples questions on upgrading to the 4S using someone else's plan, I just wanted to confirm that I understand it properly.
I will be using my moms upgrade to get the 4S
as I understand, when I preorder, I will use her line to order the phone, then once I receive the phone, I will activate it on her number, then reactivate her phone on her number and activate the Iphone onto my line, correct?
A few more questions, How do I deactivate the data plan on her line? Do I have to go to the store to do this?
My moms phone is a flip phone, how do I activate a flip phone? or does it vary depending on the make and model?
When I go to activate my phone onto my line, how do I tell the phone I want to activate it on my line and not my parents line? will there just be voice prompts to follow to change what line it will be activated on? Or do I do it online from the Verizon website? 
Finally, I assume that my unlimited data plan will stay unlimited, even when upgrading through someone else's account, correct?
Thank you to anyone who replies!

Answer 1

Hello wmuav8tor,
 I'm glad you asked about the alternate upgrade for the Iphone 4S pre-order. I knew that this question was going to come up sooner or later, which is why I'm excited to answer all of your questions. For simplicity, I will explain the equipment activation process in three parts. 
Part 1:  Once the pre-order is completed on the qualified line, the two year agreement needs to be accepted. You may have to activate the device on Itunes on the qualifying line to confirm this change. Hopefully the qualified line has an Itunes account of it's own, which will make the process much easier. Because it's a smartphone it will require a data package if one isn't already on the qualified line. 
Part 2:  Once activated, you can do an electronic serial number (ESN) change at My Verizon. Here you can reactivate the original device on the qualified line and release the Iphone 4S's ESN for use on the line of your choice. I recommend that you review the features on the qualified line to ensure that you haven't removed any services by accident, like unlimited data.
Part 3:  Complete the ESN change on the line of your choice to use the Iphone 4S on an reactivate again on Itunes. I recommend having two different Apple IDs when doing the equipment swap, one for your mom and one for line that will be using the Iphone 4S going forward. Assuming that the line that you want to use the Iphone 4S already has unlimited data then you will be able to enjoy this package after the device activation. 
Side note: Unlimited data packages cannot be added on a line that does NOT already have it. So if the qualified number has it and the number of choice doesn't then current data pricing is required. 
Feel free to respond is you have any additional questions or concerns.
Thank you...