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My iphone has no sounds on the ear pice. I can only hear something when the Blue tooth or speaker phone is activated. I think the ear pice needs to be fixed or replaced. Can this be fixed or replaced easily?

this guide is for a 3gs but the principle and the part is the same. You need to follow front display guide to get to the earpiece/proximity sensor. If you have dropped the phone or had water damage/opened phone, you might want to try opening phone and checking connector 3 isn’t loose/damaged or dirty first.

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