Share your experience!
Hi Sony,
I have some weird problem with my Xperia U. If I receive a call while listening to music through earphone, phone will only vibrate. Nothing is heard through the earphone. After receiving the call, call timer display will come start after 4-5 seconds. Now, nothing is audible. I removed the earphone, then also loudspeaker both front and back is not working. After disconnecting the call, I played the music, but nothing is audible
I received a call without earphone plugged in, loudspeaker totally stopped working
Only way to set it right is to restart the phone!!!
Please let me know whether this is a software issue or hardware issue. If hardware issue, guide me to get a replacement. If software, fix it ASAP.
This should be fixed soon.
Please help!!!! 
Thanks,
Adi
I'm sorry to hear you are having problems Adi. I currently use the Xperia U and I don't experience any of these problems. Are you using the earphones which came with the handset or are they third party?
Have you tried repairing the software in the handset through PC Companion to see if this makes any difference?
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I am using the one received in thr box. 
Now I made a call and pressed on loudspeaker to activate it. All of a sudden I hear one sound like zrr.... rzrrrrrr.....zzrrrr.....like a drilling machine 
something is wrong
I received a call while earphone plugged in. Thats it... loudspeaker is dead now
and some sound of drilling machine....
pls help 
If this is any sort of hardware issue, let me know immediately
and how should I get a replacement ?
I have not updated the software yet... I will try..
We wouldn't be able to confirm whether this is hardware or software at this stage. Try updating the software and see if that corrects the issue for you. If it does not correct the issue, I would suggest that you contact the store which sold you the handset.
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Okay... I will update the software today... lets see... 
I'm facing the same problem since i've bought the phone! Whenever I'm listenng to music with my earplugs on and I recieve a call in between, then everything goes mute. If i recieve the call, then nothing is audible and it automatically gets disconnected in 4-5 secs. As rightly said by Adi, nothing works after that...like music and volume related things. Restarting the phone solves the issue.
I found only one solution to this is to take pre-caution abt it. I usually connect the earphone and dial any no. at the beginning before I play music. then whichever call i recieve, i'm able to answer it.
But it doesn't solve the main issue. Pls help me out from this.
Regards,
I too facing the same problem even after i updated the software! 
could a mix match be an issue? as the earphones we get along has sony ericsson tag to it, and the phone is of "sony" and though behind the xperia u its having sony ericsson logo?!
though the earphones are only able work in xperia u, as i plugged them in my arc s and it said heaset not supported...
i don't know but it has speaker issue, now this issue... dunno what more! 
No luck
I have updated my phone to recent available update ... but the problem is as it is
Aimee, please guide what should I do? My phone is up to date. You can see the same problem is reported my many here 
If anyone got the replacement in Bangalore, India, please let me know whom should I approach.