So, I know how to increase the volume of my ringtone, but when someone actually calls or I call someone, I can barely hear them. Any suggestions as to how I can make that louder?
The side volume buttons change to call volume buttons when on a call. Next time your on a call look at the display press the + and check to make sure the call volume is all the way up.
and if that doesnt work then it could be a problem with the speaker. because I had the same type of problem with my 3gs where i could only hear calls if I put them on speaker phone