This is confusing. Of course a 3g SIM won't work In a 4g phone. They are different sizes physically and the 3g won't fit in the 4g device.
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In my opinion, the best screen protector is a flip cover. It protects the screen when not in use and doesn't affect the device at all, plus it doubles as a stand when using it.
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If it helps any, I haven't even looked at my laptop in 4 months. I do everything on this tablet. It's a solid device.
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