Share your experience!
I bought S around 10 days ago and today i started having problem in its loud speker.
Lots of jerk in the audio from loudspeaker, ringtone, audio / video played through loudspeaker have these jerks. Audio is barely audible. All you here is glitches and jerks
Not sure if it is hardware of software issue, but 1st time i restarted my phone problem got solved. After few hours the same issue repeated and not solving even after 3 restarts.
Kindly suggest.
Best Regards,
Rahul
Dial *#*#7378423#*#* in dialer and tap on service tests> speaker > see if you hear the same noise or not
if not then do the following 
Update/Repair your phone via PCC OR SUS
PCC (PC COMPANION) – Repair your software with this .First do the setup without connecting your mobile to pc.(only connect when you are asked to).
Do it as follow >> PCC > SUPPORT ZONE> SOFTWARE UPDATE> REPAIR SOFTWARE (written with blue)
PC Companion http://www.sonymobile.com/global-en/tools/pc-companion/
SUS ( Sony Update Service) ... download and install it on pc and follow the on-screen instructions http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
or
http://www.sonymobile.com/global-en/tools/update-service/
Both the links are same
getting the same jerked audio in speaker and stereo speaker tests. Does that mean it is a hardware problem ??
repaired your phone with either SUS or PCC (check links above) and test your phone again
Don't forget to backup your phone
Alternatives on How to backup Xperias
Service center guys are likely to start with software repair anyhow
So its better to do yourself, chances are there that the problem may vanish 
I'm getting the same issue with my Xperia s, the loudspeaker is not working.
I installed the PC Companion but when i try to repair my phone i got the following error message:
"Server is currently not accessible" also when i try the option "repair phone" i got Application could not be installed.
Can anyone help please.
BR
See my post above and use SUS 
I did the SUS procedure, but the LoudSpeaker is always not working.
It Could be some Hardware issue then???
Oh yes then it could be,,
Beter to get is it checked at service center
hi
i have the same problem
i go to service center now after 10 days until now they say we wait the spare part
I'm a fan of Sony
But this is the worst service maintenance
10 days waiting spare part (this is not my problem)
I want a solution