Hearphone is very low

Jessa is correct. If you provide more information, it'll be easier for someone to help you diagnose this issue. Based on the totally vague title and description of your problem, I'll take a wildly blind shot in the dark and say you are probably referring to the earpiece being hard to hear. Take a Qtip and rubbing alcohol and gently clean the mesh. Windex and a Qtip will often work also. The mesh will get plugged with debris/body oil/ etc and cause a "hard to hear" situation. Just a guess...