hello everyone for those of you that are not as thick as 2 short planks and have tryed all the above [including turn up the volume lol] i had same problem with wife iphone 6 for over a year changed speaker cleaned hear port out changed setting but still the same ok here goes go on ebay buy a new screen cost about £6.00 and anyone who can change a plug can change a iphone screen they even come with the tool kit to do the job and by magic she can hear me again doh !