this problem is not only a headset problem, its a over all volume issue (most importantly handset) I have that problem too, here is three possible solutions that worked for me, and "MIGHT" work for you.
Give these a try and be sure to give a feedback whether it works for you or not:
A) Enter service mode by typing below code on your dialer :
*#*#197328640#*#*
click the following:
[5] AUDIO
[1] NB (VOICE CALL)
Choose Handset, headset, Speaker (which ever you want higher volume)
[1] VOLUME
[1] SRC Speech RX Volume
Change default values and higher the values any number of your choosing, here is an example:
[0]0_lvl : 68
[1]1_lvl : 72
[2]2_lvl : 76
[3]3_lvl : 80
[4]4_lvl : 84
[5]5_lvl : 88 Higher these values to until hear volume improvement.
Can also edit the values from:
[2]DST I2S1 TX Volume
[3]SRC I2S1 RX Volume: 100
[4]DST Speech TX Volume: 94
This is Samsung volume setting, worked for several people but sadly only worked 2 times for me and values keep resetting for me (doesn't mean for you, so give it a try) Also this is based on STOCK firmware.
B) the second thing you might to try is app called Volume+:
http://androidaudiohacks.com/home/vo...bread/download
This app guarantees it higher the volume without the need of touching its default settings, BUT huge drawback it highers everything: Headset, speaker and Bluetooth EXCEPT HANDSET which is the most important :-(
(I also downloaded many volume increase apps, but Volume+ was the only one got the job done for everything but handset)
C) Lastly get GOOGLE VOICE app (create a GV account if you don't have one)
https://market.android.com/details?id=com.google.android.apps.googlevoice&feature=search_result
just by installing Google and logging on, every time you make a call, your calls get forwarded through Google voice and volume levels become acceptable in ALL HANDSET, HEADSET, SPEAKER, BLUETOOTH (just like phone should of have been) (this what i personally use fix my volume issues)
Hope one of these work for you.
