Bought gs290 in /e/ store. Same problem echo in my car. Hope that will be soon fixed.
Still ocuring with latest 0.15 build.
I just got my GS290 and unfortunately I can’t use a Bluetooth headset because I constantly hear my voice back when I am talking. Is there something I can do?
This is a major issue. Echo on all calls using bluetooth. I have tried 4 different headsets and in my car, same problem. So much echo that it cant be used at all. Headsets can be used when listening to music only, but if someone calls or I would like to call I have to disconnect bluetooth to my car or headset. The audio feedback from my own microphone is far to high and i cant have a useful conversation.
Exactly, same problem here. I hope that it can be fixed. Did you already get an answer from the developers?
Totally agree this issue… major issue me too. Im using my phone about 8h per day for Bluetooth calls and now i cant use phone at all.
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perhaps, you can complete the issue on gitlab
It is done, thank you.
Same issue here. 2 hours in the car every day, no phone. 
Besides that great device and great OS.
still echo present in car with the latest build e-0.16-q-20210414110657…at least my little son has fun with it
edit.: besides of that really nice stable and fast os.
I would like to add that the echoes do not occur when switching to a messenger based call like a signal call. It is not a complete workaround but it helps as you still can use the car’s audio system then.
Echo
is still alive with the new update 0.17q
As much as I appreciate the whole project: This is super annoying. 
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It is true that it would be good, the problem is really embarrassing.
Thank you.
I can confirm this issue with my GS290. Reported on Github.
My understanding is the Bluetooth echo is fixed in the next /e/ release (version 0.18) which will be available the 3rd week of August 2021.
0.18 Fixed…all good, no echo
Houra!
At least we will use our phone in the car!
Finally fixed… I was waited 8 months for this. By the way /e/ os is much stable than lineage os with micro g what i was use in last phone. Great job e team!
Bravo! Yes, really good job. Finally a phone I am really happy with. TY, support team!