I have a problem with my HC-05 bluetooth module I have been trying to solve for 3 days now. When I power up my arduino uno the module lights up as if ready to be connected to a device but it doesn't appear on my phone. I thought it might be a problem with my phone so I used other devices but the module doens't appear on any device. I don't think it is a problem with my code because I tried another one and it didn't change anything. Does anyone have an idea why it isn't working? Could it be the module itself that isn't working?