Bluetooth: Can you make the phone invisible to other devices

It does work this way but that means the device is constantly searching for new devices to pair. In other words if I enter a location where there is a Bluetooth device my phone is scanning in the belief I want to pair it with another device thus affecting battery life. Is that correct?

ncG1vNJzZmien6fCrr%2BNmqWdqp%2BesaSxza2pmqRemLyue9OhqZ6ZlKh8o7jUnquop6SdeqStzWawqK1doq6ssYytn55loJ28r7GMoqWvoaOer62xjK2mZqeknbKzecOeraKblah7eH%2BYaWtsZw%3D%3D