There is a problem with headset. It does not work properly.Sometimes the headset is inserted but does not work.Sometimes when it is inserted, the phone speaker still the one that works, or sometimes my speaker phone does not work I have to insert the headset and then the speaker phone will work instead the headset.
I need to always restart my phone to fix the problem.
I told the seller about this problem but they don't know anything about the issue.
Just insert all 4 pins of headphone into headphone jack with littel force and when the 4th pin inserted into the headphone jack your hear the click sound and then you enjoy the headphone and receive call and use your mic