When you phone cannot be found by other phones, you can do the following:
Make sure Bluetooth is on. (Settings > Bluetooth (in ‘Networks’ tab if tab view in active) > Set the toggle switch to ON
Note the name of your phone (in this example: My LG G2)
Make sure you are not too far away from the other device. Most Bluetooth devices have a range of max. 10 meters.
Bluetooth devices have a discoverability setting, allowing your phone to be found or to stay hidden.
Check if the phone visibility is on (marked), via Settings > Bluetooth (in ‘Networks’ tab if tab view in active) > mark the checkbox under Make phone visible
Note: typically, the phone visibility timer is set to 2 minutes. After that time, it becomes invisible again. On most devices you can change the visibility timeout
Let the other phone search for Bluetooth devices again. Your phone should now become visible for the other phone.
Note: if the other phone cannot find any Bluetooth devices, the problem may be linked with that device.