I bought today a USB OTG cable and it works perfectly with 2 of my 3 USB sticks. The 3rd one just won't mount, when I connect the stick it shows me it was connected but nothing else happens.
Unfortunately I don't have a PC to test the USB stick or something, I really need to access the data via. USB OTG with my phone.
I'm on a stick unrooted KitKat if that helps.
Sent from my LG-D802 using xda app-developers app