My Blackberry broke, and I have a jailbroken iPhone 4. Can I use that instead now?

My Blackberry broke and I'm worried whether that I'll have to pay to get a new phone from Verizon. However, I realized that my dad has an extra jailbroken iPhone 4 that he never really used before. Can I request a SIM card for the iPhone and not have to pay for anything at all?

If the iPhone and BlackBerry are both from Verizon, yes you can. If you get one (iPhone) that is originally from ATT, then it won't work with verizon. Sim cards with Verizon are only used for 4G, or as calling in foreign countries on their world-phones.