I have a new iPhone 8 Plus that is less than 6 months old. It will not ring when a call comes in, it only vibrates. I have a game I downloaded called "Toon blast" will does not have any audio when playing unless I have an aux cord plugged in the phone and the other end into a car radio. It use to work fine and then one night it just started acting weird. I've checked the settings and everything to make sure I didn't mute anything. I also did the software update thinking that would fix it. Nope, it didn't
Read more: What happened to the sound in my new iPhone 8 plus?