(Verizon) When using upgrade of another line....

If you're doing it at a Verizon store, they'll take care of everything. If you're ordering it online, switch the upgrade then order the phone. Thats what I did. Worked flawlessly.

 

Don't switch the phone on otherwise the SIM card will be attached to the new number.

 

I recommend you call them and tell them to switch the sim to the line you want the iphone on BEFORE you turn it on.

If you do activate it and want to switch to another line here's what I had to do on launch day (don't know if they've fixed this since then):

1. Activate phone
2. call and have them dummy out the line and put the sim to sleep or rest (or whatever term they use..)
3. login online (or call) and activate it on the 'correct' line the next day (they tell you 24 hours after step '2' above but I was able to do it the next morning online.

Alternatively, you may be able to activate it online before turning on the phone for the first time (on the non-upgrade line)

Confused yet?