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    Help I'm getting an 'Invalid sim' message with EE 4G sim

    Please help. I have 2 Samsung S4 i9505 phones. I bought both second hand. Phone one was locked to the Three network, I had it unlocked by the network, and it now works perfectly with my EE 4G sim. This phone froze while I was upgrading to Lollipop and could not be rebooted, luckily it was still...