How to activate iPhone 4 without SIM?

Okay, so my sister gave me her old iPhone 4 because her boyfriend bought her a new iPhone. She told me I had to restore it before I could use it, so I did. Unfortunetly, she took her SIM to her boyfriends house, but she's gunna give me it tomorrow. I'm just wondering if I can activate without it? Please and thank-you.

Is it att? Why do you need her sim you need a new sim. And why is she not using her sim iin her new iphone?

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