You do not need to have an "unlocked" phone, any verizon phone except prepaid will work.
Didn't work on my lg-vx11000
FYI: Just activated an iPhone 4 on pageplus. On my first attempt they noticed from the esn that it was an iphone and told me it was banned, but on the second attempt the activation went thru no prob.
Nice, so anyone have a Galaxy Nexus on PP yet?