Will my iphone sim card work in a blackberry?

I have a sim card that fits for iPhone 4. I was wondering if I bought a blackberry from a friend, is it the right size? Or do Blackberry phones have a different size sim card or something.

Yes it will all you have to do is make sure your metal connectors on the Sim are lined up with the one in the blackberry. This worked for me with a iPhone Sim and a blackberry 9300.

Yes
It should work as long as both phones are GSM and both sim card slots are of same size

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