Hey, I've seen a few threads about how to upgrade to an iPhone on Verizon by taking an upgrade from another line. I just completed the process, so I would like to share my experience. The primary account holder on my Family Plan was eligible for an upgrade ( +$100 off, sweet!) and my line was not. But I wanted an iPhone to replace my original BB Storm. So.. I went to verizonwireless.com and clicked buy iPhone 4. It then brought me to a page showing all the line and which were eligible for upgrades. I choose the primary account holders, choose my iPhone 4, choose my plan features (internet package), got my $100 off, and off I was. Free overnight shipping, awesome. Then, when the phone arrived. I plugged it into iTunes, activating it. Then, I went onto MyVerizon, went to Activate Device, and reactivated the old phone on the primary line, deactivating the iPhone. Then, you repeat the same thing, except after hitting activate device, choose the line you want the iPhone on, and put in the MEDI. For me, I could not do this online for whatever reason, so I had to call Customer Service. Took at whole 10 minutes, no big deal. And that's it! The primary line's contract was extended, mine was not. Therefore, my upgrade eligibility is still in tact. This was one of the main concerns of the threads I saw. If you have any questions, post here! Btw, I love the iPhone! No problems so far!