Verizon contract fulfilled, yet no other carrier will touch my iPhone 4?
The iPhone 4 built for Verizon's network is a CDMA-only device that is not capable of operating on a GSM network that requires a SIM card, such as StraightTalk (which uses T-Mobile's network). That said, Page Plus operates on Verizon so there shouldn't be any impediment assuming you've had the phone unlocked already.

This thread indicates that Page Plus phone reps are hit-or-miss when it comes to allowing you to use an iPhone. About halfway down the page there are steps for doing so online, thereby avoiding the troublesome CSRs.


  
  Activate online. This costs $10.
  Wait (10) minutes, then dial *22890. This will program the iPhone 4 and takes about 30 seconds.
  Dial 611, "Welcome to PPC"
  Use any third party like Pinzoo or CallingMart to buy a calling package &amp; Pin. PPC didn't let me use PayPal.