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Question: phone went dead.

I have had my phone 9 months or so and have never had any problem until today.I was having a conversation and it just went dead' this happend 8-9 times talking to the same person, or trying to. Later on that day I was talking and the same thing happend except I could still hear them but they couldn't hear me.I had almost a full charge.Can you please help. Thank you.