Connecting mouse to phone
As per Wikipedia, an OTG cable has to have an extra connection (ID) with a resistor or connection to ground.

Its value depends on how you want the devices to be powered / interact:


  Short to GND - Becomes OTG A device
  
  124 kΩ - A charger and either no device or an A-device that is not asserting 
  VBUS (not providing power) are attached. The OTG device is allowed to
  charge and initiate SRP but not connect.
  
  68 kΩ - A charger and an A-device that is asserting VBUS (is providing power)
  are attached. The OTG device is allowed to charge and connect but not
  initiate SRP.
  
  36.5 kΩ - A charger and a B-device are attached. The OTG device is allowed to
  charge and enter host mode.


So I'm afraid that using a random micro USB cable will not work. You need to find one that has an internal connection to the extra pin(ID) and short it to GND: