How to activate my iPhone 4 without a sim card?

My sister gave me her iPhone 4 cause she got a new one, and I just restored it cause I wanted to get rid of all the photos she had on there and apps and stuff, but when I go to activate it, it says something about a sim card and all. I don't have a sim card nor does my sister or anyone else, cause i just want to use it like an ipod, I'm not going to call anyone or anything. I can't see a skip button or anything on the page either. Could someone help? This is just an iPhone 4. Not an iPhone 4S or anything

Added (1). P.S I do have Wi-Fi at home and I've put the password in, but it goes to 'activating your iphone' then it says there's no sim in the phone.

I would suggest going to the apple store and asking them about this. Their really helpful!

If you have Wi-Fi at home connect to it and use that, should go straight through

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