iPhone 7 Plus no sound when making or receiving calls
Hi looking for some help.
My iPhone 7 Plus has suddenly stopped working properly with no obvious reason. When I make a call the sound through the ear speaker (not quite sure the correct terminology) is crackly and distorted, if I switch to speaker phone it is the same. When receiving a call and swiping to answer my phone answers the call but continues to vibrate and has no sound. This has continued for most of the day but now when I call or recieve a call there is no sound at all even through the speakers. when I use my phone through my car speakers it works fine. I have factory reset and cleaned my phone but nothing seems to help.
Anyone any any ideas on how to sort this? Thanks
iPhone 7 Plus, iOS 11.4.1, Updated yesterday to iOS 11.4.1