Carrier Verizon - keeping unlimited data

[nonicali]

Sorry if this question has already been asked. I'm really confused and hoping someone can clarify. I heard I may lose my unlimited data if I upgrade and wanted to know my options. Both of my lines are eligible for an upgrade.

Line 1: Old Blackberry Bold with unlimited data, nationwide talk fs 700, 1000 text
Line 2: Iphone 4s, 2gb, nationwide talk fs 700, 250 text

I want to upgrade my blackberry line and keep my plan the same. I really do not want to lose my unlimited data on line 1. Do I use my iphone 4s upgrade on line 2 then call Verizon and switch it to line 1? Or do I have to add a line 3 or pay full retail?

 

[djyoungcity]

http://www.reddit.com/r/verizon/comments/1mc8v7/the_new_improved_update_guide_on_how_to_keep_your/

Upgrade on the other line, move the phone to your main line. Keep your unlimited data. If you want to upgrade the 2ndary line, transfer the upgrade from your main line to the 2ndary line and upgrade again.

 

[DollaTwentyFive]

Provided they are both individual lines - it looks like they are, then you should be able to use the upgrade on the 4S line and then put the 4S back on that line and move the 5s to your BB line. I would suggest doing this on your account on the verizon website, however. I still have unlimited data and every time I speak to a CSR on the phone, their ultimate mission seems to be to get me onto a tiered data plan.