Reply #4 is nonsense. OP clearly states that Bluetooth is on a JY-MCU board, and therefore requires 3.6 to 6v as clearly stated on the back thereof. 3.3v is a no-no.
This is nebulous, and may imply that Bluetooth has not been paired, i.e. an Android problem. Have you paired Bluetooth in the Bluetooth settings? Please don't tell us you have an iPhone.