i have this with my lumia 620 too, but a slimple reboot doesnt solve it, because i had it with my older phones either, galaxy ace, iphone 3gs, xperia sola, al the same problem, one ear doesnt work, later...both doesnt work, so i dont use my audiojack now, being afraid this will happen with the lumia 620 tooo, help? tried several reboots
sorry for my bad english, coming from the netherlands(16y/o)