I iPhone 13 Pro with OtterBox defender breaks up on the other end when using speakerphone people can’t hear me
iPhone 13 Pro with OtterBox defender breaks up when using speakerphone people can’t hear me
iPhone 13 Pro
Have you tried removing the OtterBox and testing a call and see if it works correctly without the case on. If it does, then make contact with OtterBox about their product.