IPhone Sim Cards (Virgin Mobile)?

I currently have an iPhone 4 with Virgin Mobile's service. I'm interested in switching to straight talk's $45 plan simply because its a cheaper unlimited plan than virgin offers. However, Virgin phones don't use SIM cards and I know that you need one for straight talk. Because my phone doesn't use one, does that also mean it doesn't have the slot for one? If anyone knows from experience Please help me out.

No slot. Your phone works on the CDMA network. CIM card phones work on the GSM network.

I know from experience.

Virgin Mobile USA phones are LOCKED to Virgin Mobile USA's network FOREVER. They can NEVER be taken off. I guarantee it 100%.

Virgin Mobile USA iPhones do not come with a SIM card slot seeing as you'll never be able to use a SIM card because the phone is locked on Virgin's network forever.

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