Can I use a factory unlocked iPhone 4 with simple mobile?

Is there anyway i can connect it with simple mobile? If i buy it off of ebay and then just switch my normal sim card that i have connected with my blackberry connected with simple mobile and put it in the phone? How much will i be paying monthly? Anything helps please.

Yes you can, my brother uses simple mobile $40 unlimited plan.
you would need a micro sim card, and jailbreak it to get the mms working.

Yes you can.

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