Hi I am using my Nokia 8 since last 6 months and I have been facing this issue. Initially I felt the call volume was reduced but I went to care center and they checked and said that due to some dust the ear piece is getting clogged and hence the volume has reduced. As a solution, they cleaned the earpiece with a brush. After a 2 months I again got the same issue, again went to care center and again they did the same thing cleaned it with a brush. They said this is a frequent problem with current Nokia devices, it has been a problem for many users not only with Nokia 8 but for other phones like the Nokia 3,5 as well. Please help with this issue urgently.