How to check if iPhone 3GS is good?

Thomas Pham

New member
I am buying an unlocked iPhone 3GS off of somebody from Craigslist soon, I am wondering what do I have to do to check if it is still good.
I never owned and Iphone before and not sure how it works.\
What are the basic fast and easy checkings I can do at the spot to see if it functions right?
The guy says its charged and ready to be test. And said we can put the SIM card in to test it out as well.
 
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