So I bought this dynamic shure microphone : https://www.amazon.fr/gp/product/B00FXO5CEW/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
I've tried using it on a karaoke app (Smule) on my mobile phone.
To record I usually plugged my headphone and my old mic to a a little wire with 2 input (mic and headphone) and one output that I plug to the phone. Like this one : https://www.amazon.fr/Lindy-35509-adaptateur-T%C3%A9l%C3%A9phone-portable/dp/B006K11520/ref=sr_1_13?s=musical-instruments&ie=UTF8&qid=1469733054&sr=1-13&keywords=jack+2+entree+1+sortie
Now I bought also a wire XLR/Mini-jack to be able to plug my shure to the mic input like this one : https://www.amazon.fr/gp/product/B0033YINHC/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
Bottom line : the mic input doesn't work when I plug it to the phone adapter. It does work when I plug the Shure straight to the phone though, but I can't hear the audio output anymore.
What am I missing ?