IPhone 4S problem when restoring?

My iPhone was on iOS 5.1 and I restored it to 6.1.3 because I was going to get iOS 7 and when I restored it, it came to the activation screen and said I don't have a SIM card. Yes, I didn't have one at that time but it was bricked and I paid someone to get it fixed. Was it worth it and how do I fix this? Because I want to attempt again but I still don't have SIM card and I don't want my iPhone 4S to get bricked again. Can someone help me please? 10 points and 5 star rating to the best answer.

You need to register your device's UDID with a developer account as soon as possible, through a site like http://www.udid.in/.It's $5, and then you'll be able to activate and won't need to worry about Apple disabling your device for running unreleased software.

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