IPhone to blackberry sim card?

I have been having some problems with my blackberry deleting everything. My friend got a new iPhone so she have me her old one (iPhone 4). She thought I would just have to switch over the sim card and it would work. Unfortunately, when I checked the iPhone has a micro sim card where as my blackberry has the full sized. How can I activate the iPhone with the same number yet still be able to use my blackberry (not necessarily at the same time I would just like to have my blackberry as I'm paying for those features such as bbm ect.)? I believe she left her old sim card in her phone so is there any way to activate that or something?
Any help is appreciated!

You will not be able to use the same number for both phones. If you really want to use both phones, you will just have to have 2 different phone numbers.

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