No SIM card, tried to upgrade to iOS 8, now I can't use device at all

I decided not to use AT&T any longer a while back and got rid of the SIM card.  I did not know I needed it!  Now I have used iTunes to upgrade to iOS 8 and it won't let me use it.  Is there anything I can do?
Thanks!

Hey Username000,
Thanks for the question. When using an iPhone without a wireless service plan, you will need to insert a SIM card from a new activated phone before restoring or updating it:
Using an iPhone without a wireless service plan
http://support.apple.com/kb/HT3406
Thanks,
Matt M.

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