Iphone backup / activation help needed?

Hi, I got an iphone 2G 8gig from my friend and she has a lot of applications on it but when i insert my sim card it says i need to reactivate using itunes. I was wondering if there is a way to backup all the apps that are already on there without activating it first just in case so i dont lose all the crap. My friend lost her sim card. So is there any way to back it up??
 
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