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    I upgraded my (unlocked) iPhone 3gs but now it doesn't read my sim card?

    Hi, I live overseas and recently bought an unlocked iPhone 3GS that I had hooked up to iTunes. Everything worked fine and my sim card from this country was valid. When I disconnected it and reconnected it, a sign popped up saying i could upgrade to iOS 4 or something, so I clicked update. Then...
  2. C

    Child cognitive development tests?

    What method/experiment would you conduct to test how a child's way of solving a problem changes as they grow?
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