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Dear Sir/Madam,
I have been experiencing a peculiar issue with my xperia z1 [IMEI removed] after it got OTA upgrade to 14.5.A.0.270 that I would like to bring to your notice.
The voice quality during call in GSM mode is found deteriorated. Although I can hear the other person properly but the person from the other end can't hear me properly. Outgoing voice always breaks and generates echoes or waves. The problem instantly disappears if I change to WCDMA mode from GSM. In GSM also the problem disappears if I use a headphone or bluetooth headphone instead of built in mic. But in wcdma mode built in mic also works fine.
I am really disappointed as this can't be expected from a leading pioneer electronics goods provider like sony that also with a flagship product like xperia z 1. I have visited service centre also, reinstalled software but same problem persists.
After going through internet I came to know that many users are experiencing the same issue. I would like to request you kindly provide required and appropriate resolution by attending the issue at the earliest.
Regards,
DIPANKAR SAIKIA
Mobile No. [removed]
Solved! Go to Solution.
I am a die hard fan of SONY Mobile. I got my Lollypop 5.1.1 update yesterday for my Xperia Z1 and since then my voice is echoeing back during call. It is very irritating and dont know what to do. Kindly someone advise me.
Sorry to hear that.
Which build number do you have under Settings -> About phone?
Do you have this issue regardless who you're calling (please try calling fixed and mobile number)?
Hi Rickard,
Glad to hear that it works now 
Not sure what could have caused that but let us now in case it happens again.
Hi,
I have the same issues with my Z1 compact. The microphone works well when I do the diagnose. The recording sounds good to me.
But when I do a phone call I have echoes, interruptions and strange noises reported by the other side.
Please help me. I need this phone for business.
Thanks