Can I put a FIDO (Canadian provider) sim card into my American AT&T Iphone 3G?

sleep-deprived

New member
If I get a data plan from FIDO and get my Iphone jailbroken, will I be able to use all the apps that are currently installed on the Iphone?
But first and foremost, I just want to know if I can swap the sim cards because I'm going to be traveling between Canada and the States for the next 2 months, so I need to be able to use both phones..... but I prefer my Iphone!
Also, if the Iphone is jailbroken, then will AT&T still work on it?
 
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