I tried to update my iphone 4 but it just reset and when I tried to activate it, it won't let me.

I was updating my iphone 4 with itunes, and it suddenly stopped and the message
'We're sorry, we are unable to continue with your activation at this time.
Please try again later, or contact customer care.'
popped up in the itunes screen.
I was at the stage when the apple logo was on the screen and the bar was loading.
My iphone does not have a SIM card because this is my mom's old phone, and she is using the SIM card with her galaxy note 2.
I turned on my iphone, and it was on the 'set up' stage.
Since I backed it up today, I tried to activate it.
but when I got past the stage with the Wifi, and it said it was activating, the same message popped up again. That message is also still in the itunes' iphone page.(itunes is working normally but when I click the iphone tab that message shows up. I can go back to itunes)
So, I can't restore, use the backup, or do anything using itunes except charging it. itunes still recognises my iphone.
I can restart my iphone. I already restarted my iphone and my computer, bur it still doesn't work.
How can I restart it? Or am  I just stupid and I need to put the SIM card back and try it again?

You can't activate any GSM iPhone without a valid sim card installed in the phone.
So, yes, you need to get a sim card.

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