Audio splitter cable not working with phone

Nov 28, 2018
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I have just bought a splitter cable with a headphone and mic insert for my android phone in hopes Of being able to record audio or video while simultaneously monitoring the audio. When inserting headphones into headphone jack of the splitter I can use the headphones as normal but there is no sound coming from lavalier Mic inserted into mic input of splitter. Any help would be appreciated