Can I put a virgin mobile prepaid SIM card into an iPhone 4/4s?

I have a Virgine Mobile (Canada) Galaxy Gio, on a 35$/month prepaid plan, and i was wondering if can take out the Sim card and reinsert it into an iPhone 4/4s? Also, would i have to jailbreak the iPhone?

Definitely jailbreak, and definitely unlock it, both need to be done for any sim change. I can't help with the unlocking as I'm only familiar with tmobile unlocks, but for both you can try cydias forums
http://cydiaforums.com/content/
This should help

It all depends if virgin has provisioning to support the iPhone on their pre-paid system… (Provisioning in the cellphone world means codes on the network that have to match with codes in the iPhone.) best bet is find a friend who has an iPhone and slap your sim in it. Don't go to virgin first considering they want you on a contract with the iPhone and they will likely say no just to turn you away from that idea. And I seriously doubt that you have to jailbreak it…

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