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■ About high charges for data roaming.
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■ Why doesn't the amount of remaining data decrease even though you are using data communication?
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■ What should you do if you can only get a 3G line?
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■ What should you do if you see "SOS" or "SOS only" on your iPhone?
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■ No signal, no antenna, no signal coverage.
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■ You did not use the product after purchase, can you get a refund?