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The sound is very bad/noisy while calling, but if I use a headphone o turn on the speaker then it works perfect. I hope you can help me ;) Thanks in advance
If you are talking about the top earpiece speaker that is used to hear people during calls then it is either badly mounted or faulty. Replacing it should do the trick if it just suddenly started happening out of nowhere and screen hasn’t been replaced before. You hear a crackling or bad sound quality sound from it right? Where you can get the part: iPhone 6 Earpiece Speaker Guide to replacing it: iPhone 6 Earpiece Speaker Replacement
