Gauravpreetsingh , via OnePlus 3T , Feb 14, 2020 : Who ever is going to reply with "Do google search before posting" or "check the forums" , ive did that already. There is a issue with OnePlus 3t where i cant talk on calls and neither can hear anything when connected on bluetooth headset. Tried with two headsets and same issue. However music and media works fine. things ive tried :- 1) Factory reset (all sorts, including reflash) 2) reset network settings 3) clear bluetooth app cache and storage 4) Turn on-off airplane mode 5) repaired devices 6) restarted phone 7) changed bluetooth audio codecs in developer options 8) checked "phone audio" in device settings in bluetooth settings page. 9) Tried on a different non one plus device- works on them. if anyone has a permanent fix, please let me know. I am running Android pie 9.0.6.