I updated my iPhone ios software but now it says my sim is not valid. Please help!

I updated my iPhone ios software but now it says my sim is not valid. Please help!
I have an iPhone 4 and yesterday I updated my software to iOS 5.1.1
Now it says my sim is not valid, which is weird because I have been using this sim since my dad bought me this phone in 2011 Nov. I live in southern Africa (Botswana) and I use Orange sim..What do I do? Please help? I'm desperate, I really cant afford another phone Oh and its not jail broken,

It might have been more helpful if you'd actually mentioned that to begin with.
See this article: http://support.apple.com/kb/TS1567

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