Asking this question for my sister. She has an iPhone 4s. Recently when makes calls people can't hear her on the phone. She can hear them but can't hear her.
Took to apple and tested all the microphones and they work on face time and videos. They want us to reset phone since think is a software issue. Going to try this after backup. Also to restore as a new phone. If this fails her upgrade isn't until nov. Would she be able to get an early upgrade since apple couldn't fix phone. They would replace it with a 4 s again for 199 which isn't worth it.