How to set up an iphone when it says activation problem?

I got a second hand iphone 3gs yesturday and it came on ios3 i think and i want to update it because i can't get the apps i wanted! I don't have a sim in it yet but it was working fine yesturday before i tried to restore and update it to ios6 and now all it comes up is "activation error, activation request could not be completed, try again later or contact customer service". I have turned it off an back on, iv tried to start over and when i plugged it into itunes it came up the same message so i can't do anything with it.

Put in side the SIM card then plug it in

I don't know man i just did the same thing you did haha

Try to activate it with original Sim that was
bundled with the iPhone

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