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my cell phone started to not allow me to make phone calls out to anyone. I can answer the call but the speaker is greyed out on the phone when attempting to make or accept a call. I am able to receive text from others except for one friend that has a iPhone 7 plus. I can search the web. Now it is powering off every now and then

this is a common issue in iPhone 7 , the cause is the audio IC need jumper .