I did some research on iphones since quite a few people are asking me questions on this. I believe pageplus does not support iphones officially. But I can activate iphones for you. It is free as usual. But you need to program the phone manually yourself, namely write the assigned number, prl, and other configuration information into iphone yourself. Just google it, there are lot of information out there. Not that difficult, just try it step by step.
If you are in bay area, I can help you out. Email me gavincomputer@gmail.com.