OK! you have got New Oneplus One , A device with high end configuration that can compete with other branded high end smartphones out there.But still you are disappointed that you were not able to talk with your friends & relatives using headset, you might be really annoyed because of this .Your Headset might have worked properly as it supposed to be when you hear songs . But if your headset is connected while making a call you can only hear the voice of the person who is speaking on other side but they will not be able to hear you unless or until you put in speaker mode or remove the headset.If you are the one facing this issue then this is the post for you. And don’t think you’re the only person who got fed up with this Oneplus one mic issue , there are many out there and I am one among you. The solution is simple and its just a one minute of work to Fix your Oneplus One Mic issue while talking . Just follow the below steps As soon as you plug-in your headset the first thing you’ll notice is TTY Notification Icon at the Notification bar. The TTY abbreviation stands for teletypewriter, a device that allows deaf or hearing-impaired individuals to communicate via the telephone by typing text messages.So Now because of this TTY Feature it is stopping the user on the other side from hearing us. 
So now we are going to disable this TTY feature on our Oneplus One after disabling this TTY option we will be able to use our Headset without any issues , Just follow the below pictures to disable it. You can learn more about TTY by visiting this Wikipedia Link Step 1: Go to Phone Dialer in your Oneplus One >> Open settings >> (Refer pic 1) If you are using third party dialer app >> Go to the App drawer and open the Phone dialer manually(Refer Pic 2) 
Step 2 :
After Opening Go to >> Settings >> 3 dotted Menu (refer pic) 
Step 3 :
Go to Other Settings >> Open TTY Mode >>
Step 4 :
Disable TTY Mode By selecting Off in the POP UP Menu >> 
By default it will be ON which is why you used to see TTY mode when we connect to the Headset . After Disabling you will not see TTY icon anymore and you are all set now
Now Plug-in Your Headset and Your Oneplus One MIC will work while talking
If You have updated to Latest Cyanogen 12( Lolly Pop ) or Oxygen OS then refer the below pics to change the settings
Even after doing this trick if it doesn’t work for you then you can try root your phone and follow the tutorials displayed in XDA Forum as well as in OnePlus One Official Forum Share your views in the Comments
That Worked !! Thanks a lot man , I thought mic will work only if i use the official one plus one headset which cost nearly 1000INR, now after disabling the TTY all the headset works fine. Big thanks !!
Glad It worked for you !!
I have a different problem. When i use the handset, no one is able to hear me. If I put the mobile on speaker mode only other people are able to hear me. Any solution for this???
Try this method Go to Settings -> Apps -> All -> Find Phone and clear data and restart your phone and if it doesn’t solve the issue Try hard resetting your phone
Brother I m facing same earphone mic issue in one plus two. But no tty option available there in that.. What to do??
I’m having the same problem with the oneplus 5 now :/
I tried yours instructions but I couldn’t find the option to disabled that thing
Can you help please?
Sir, I’am facing a annoying problem OnePlus 7T , i.e. the mic of the handset if not responding properly ..if i call some one they tell me to speak loud …i have to place my mouth right down the mic to make them hear me….same as in voice recorder, video recorder….i tryed turning off the “Hey Google” bt it did not worked…. Plz help me out…what should i do
Did you get any resolution for this issue ?
Thanks Man !! This really worked for me.. I was tired of switching to speakers mode while talking on headphones mode.. You are a savior !!
Amazing, this works. Thanks Prakash. It happened to me 2nd time.
But recalling last time and your tips, help to solve the matter.
Will keep remember.
Hi Prakash,
I too have the same problem. The TTY mode is already set to OFF mode in my phone.
Any other suggestions to resolve this?
Hi Suresh,
Try this method Go to Settings -> Apps -> All -> Find Phone and clear data and restart your phone and if it doesn’t solve the issue Try hard resetting your phone, If this doesn’t work may be you should try the tutorials displayed in XDA Forum & OnePlus One Official Forum
Prakash, originally this worked but then I upgraded to the latest version of CM 12.0-YNG1TAS213 and now mic never works and its very annoying. This is definitely a software bug as using above steps worked.
i found a way that isnt mention anywhere …. but its freaking weird and stupid ! take a stereo jack male , you can even cut the wire …. :/ no comment … and then you just have to go to the tty option and choose TTTY VCO and et VOILA !!!! why dont ask me … i tryed so many thing that i found that ….
Amazing, this works. Thanks Prakash.
Glad. It worked Prakash. Thanks
Hi Prakash,
I m facing the same problem too in OP3. But I tried finding the TTY mode in settings, but its not visible in Marshmello.
Could you help me out pls…??
I need this solution too
same here man . everythinng else is fine while in loud speaker no one can hear me. and yes even tty option on my one plus 3
My oneplusone cell phone I can hear opposite side their voice but other side can not hear my voice at all. It started doing this few days ago. Cell phone repairer said mic issue but later he said may be mother board. How to get it fixed.
Hi.. I can’t find the TTY option.. And I do. Not want to root my phone.. Can you help me with something else?? It’s a pain to keep shouting while talking to someone
Hi ,
People who are using marshmallow can find TTY under accessiblity .
Hi I have one plus X, but not able to find TTY setting neither in call settings nor in accessibility.
My phone is android 6.0.1 Marshmallow…
Please help.
Even now it is not working
https://youtu.be/R9JpxpJ135w
Yes I got solution, thanks a lot.
Hi,
I’m using one plus one mobile from last 6 months but after installing the updation my Mike and Speakers are not working. When I’m making a call to anyone, I’m not able to hear the voice to whom I have called. I can hear only, if I’ll put the mobile on speaker mode. Even I can’t hear the music as it works on when I use earphones. But, when somebody is calling me, I can hear the sound of ringtone. It means that there is no issue with the speakers. Please help me if anybody has solution on this. The issue u have mentioned is quite different and I have already checked all the solutions but nothing worked.
Please assist.
I’ve called the One Plus One customer care – they provided me steps to disable OK GOOGLE – I just did that, with a hope the problem will be resolved temporarily – the patch update is expected to resolve this soon.
Go to Settings -> Language & Inputs (Under System group) -> Voice Input (under Speech) -> Choose the settings for the Enhanced Google Services (the gear icon) -> Disable “Ok Google” detection
i have problem in oneplus two, i am not getting call to sim1 if i am in call with sim2 . Can you please provide valueble suggetions.
Thanks,
Nandu.
One plus x had no headphones facility… My Samsung earphones are not fixing into the plug…unable to hear music and cals
Try this! https://youtu.be/R9JpxpJ135w
Try disabling any call recording software that you may have installed.
99% of the times that is the culprit.
I have a oneplus X model phone
while in call after going to speaker mode when again i am switching to normal mode, my phone’s micro phone is not working.
please help me out.
Thank you very much for guidance. Now my headphone option is working for calling and receiving phone .
Thanks
Palani.
My mobile is one plus 6 I bought mobile Aug yr 2018 but my prblm is headjack when am insert the headphns to the phone and play the song was working when the headphns little rotate the song will be pause and the pins comes out for mobile headph Jack was loose what’s the solution pls tell me anybody
Actually the right speaker not working. I’ve even tried your method by offing tty mode. Then also didn’t get fixed. Please reply
Hello Sreekar ,
It seems to be Hardware problem. Before checking with any service center try the below method
https://forums.oneplus.net/threads/fixed-for-good-microphone-issue.222059/
Thank you so much for replying.
Hi I have issue with phone call… Caller hears echo.. They hear their own voice on every call.. This is annoying… I tried disabled OK Google.. Reset… Clear cache… But issue still exist… Help me..
Thanks …the issue resolved
You’re Welcome. Glad it helped!
Thanks Man , It Worked
I had faced the same issue for a week and nothing works out well. Until I merged solutions as mentioned below. Hope it helps others.
https://wordpress.com/read/feeds/23807084/posts/1160309471
Hello, I kind of have the same issue. Sometimes the volume goes down and I cannot get it up again using the volume key. In that case I have to reboot the phone to make it work again. However I have been doing this for the past couple of days and I hope they can fix this in a future update.
My one plusone cell phone I can hear opposite side’s voice but other side can not hear my voice at all. It started doing this few days ago. How to get it fixed.
Hello,
When I call anyone using my one plus x phone, the other person can hear my voice for 30-40 seconds and then it start breaking. This issue is even while using headphones and on speaker.
Please advice me…
Thank you all !
Hi I am one plus x user n facing the same problem of head phone my speaker is not working I didn’t find any tty option in my phone kindly help
Hi Prakash, I am using op3T my earphone mic eas getting detected but stopped all of a sudden (no software updates) I tried other headphones with, same issue not working. If you can provide solution for this, I will really be thankful to you mate.
Hi prakash !
I’m using the One plus 2 mobile. Can’t get mic on video calls or speaker phone.
Kindly suggest.
Pls say how to remove tty
Thanks a lot man it’s working now… u r given a great solution.
But my issue is when i used my oneplus wireless z with my laptop, same issue exist it work as a playback device but microphone doesn’t work
My k9 usb c external microphone is suddenly not working on my OnePlus 9, but works on other androids.
What could be the solution?