phone mike not working samsung

I have samsung basic smart phone SGH - T599N.

All of sudden mike stopped working from last friday. Other people cannot hear what i am talking. I though phone memory issue and deleted lot of applications. Still the same issue. How do i bring my mike back. Is there is any setting that is disabled or something by mistake or do i need to replace the phone. Please advise.
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Thomas Zucker-ScharffSolution GuideCommented:
That would be my suggestion after erasing the cache partition.  The procedure for this is different for each phone.

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Start with the basics.

See if your calls display as muted. When in a call, adjust volume both up and down.

If you used an earphone/mic, recheck using that and place a few calls, see if that works and others are able to hear you. If yes, unplug the earphone/mic and take a normal call.

Issue may lie with the hardware as well and options above may get it back to normal.

If not and if the earphone/mic works whilst normal calling does not, your phone may need to be returned for technical help/warranty.
Thomas Zucker-ScharffSolution GuideCommented:
This happened to a coworkers iPhone 6.  She was able to receive calls and make calls but needed to use the earphone jack in order to speak.  She returned the phone for a new one after the genius bar decided it was a physical handset problem.  I know yours is an android, but the answer may be the same.

In terms of erasing the cache partition, it is easy and doesn't really change any settings on your phone, but may get rid of your problem (and speed up the phone a bit).

This page has instructions for your phone:

Note that both boot to safe mode, which is worthwhile trying to see if an application is causing this problem, and wipe cache partition, will not damage your phone nor delete settings or applications.  Master reset/factory default reset will put your phone back to the state it was when you bought it - so you will need a backup. If you try the boot to safe mode and the phone works fine after that,  you will need to delete one application at a time until it works again, or delete all applications you have added, assuming you have a backup, and add them back one at a time until the phone stops working.
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