I realized the same problem in my second day of usage. To sum up here is the outline of my problem:
- Problem:
There is a echo on the other side of the line. I cant hear it, but the other person I speak hears her voice within 1-2 seconds of delay
- Conditions:
It echoes when there is protective case, stops echoing when I take it off. It also doesnt happen on hands free mode.
- Debugging1:
Since there is nothing special about my protective case, I tried to elaborate the reasons. First I thought that the case is covering the noise cancelling mic, but it doesnt. On contrary, it makes it impossible to cover that area with your hand! So, without using the cover, I tried covering that mic (I dont know it is noise cancelling mic or is it even mic, but it is at the rear side of the phone near to the bottom) with my hand and uncovering it. Then I realized, when not using the protective case I was indeliberately covering that mic(?) with the fleshy part of my thumb.
- Debugging2:
After trying almost anything mentioned in this thread, I tried master reset the phone. But before I backed up everything.
After Master reset, the echo was gone. So I restored the backup and echo came back with my backup
Then I only made a backup of my contacts to sd, made a master reset and imported my contacts back from sd, and now it seems there is no echo now.
- Conclusion:
I believe the problem is not related with hardware. It is software related. At least in my case.
Before realizing the problem I was updated my firmware to KG1, using android 2.3.3, and rooted the system. Master reset doesnt change any of these, it simply wipes of any apps
you installed and restores the apps deleted with root privileges. So it must be related either related with a deleted default app, or an installed app.
I cant recall the whole list of apps I downloaded (I downloaded too much.. really) And I dont want to restore-reset-import contacts again without knowing whether this solution is specific to me or not. But if you guys try to backup/master reset and let us know about the result, we may continue to investigate the real problem.
EDIT:
The phone seems to be fixed until the next reboot. When you restart the OS, the echo sure came back. Master resetted again, the echo is gone. Restarted again, echo is back. Phone is in the service now. Hope they change or fix it.