What do I do to activate my iphone 3g without a simcard?

I recently got a used iphone 3g off of amazon for my friends birthday. The problem is it says no sim card installed and I got it off of amazon and it came with no sim card. Is there anyway I can easily activate it because I suck with technology so… I have to be able to do this without needing a sim card and by may 15th. Also link websites I would appreciate it!

The cheapest way would be hacktivating and jailbreaking using redsn0w.
the easiest way would be buying a used at&T sim and sticking it in. It doesn't need to be working.

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