iPhone 6 plus call speaker sound reduced
My iPhone 6 plus call speaker has reduced volume. I use to be able to hear calls fine and rarely had to use max volume to hear the caller. Now, I can barely hear and if any noise around me is impossible to hear. This just started and there has been no recent damage to the phone. In addition, it seems it is more difficult for callers to hear me which is the mic. The speaker issue is unbearable.
iPhone 6 Plus, iOS 8.4