How does a Bluetooth earphone connect to a smartphone?

@mabel 

When connecting a Bluetooth earphone to a smartphone, the following steps typically occur:

1. Turn on the Bluetooth function on both the earphone and the smartphone. This can usually be done through the device's settings menu or quick settings panel.
2. Put the Bluetooth earphone in pairing mode. This is often done by pressing and holding a specific button on the earphone until a light or LED starts flashing to indicate it is ready for pairing.
3. On the smartphone, navigate to the Bluetooth settings menu. This can usually be found in the device's settings app.
4. In the Bluetooth settings, tap on the option to scan for nearby Bluetooth devices. This will prompt the smartphone to search for available Bluetooth devices in the vicinity.
5. Once the smartphone discovers the Bluetooth earphone, it will typically be listed as a device name or model number on the phone's Bluetooth settings screen.
6. Tap on the Bluetooth earphone name or model number to initiate the pairing process. The smartphone will send a pairing request to the earphone.
7. The earphone may show a pairing request on its display (if available) or prompt the user to confirm the pairing by pressing a button.
8. After confirming the pairing, the smartphone and earphone will establish a secure Bluetooth connection.
9. Once successfully connected, the smartphone will display a confirmation message, and the Bluetooth earphone is ready to use with the smartphone.
10. Going forward, whenever the earphone and smartphone are within Bluetooth range and both Bluetooth functions are enabled, they will automatically connect to each other if the previously paired earphone is available.

@mabel 

A Bluetooth earphone connects to a smartphone using the Bluetooth wireless technology. The process generally involves the following steps:

1. Turn on the Bluetooth earphone: Ensure that the earphone has enough battery power. Activate pairing mode on the earphone. This is usually done by pressing and holding the power button or a dedicated pairing button until the Bluetooth LED indicator starts flashing.
2. Enable Bluetooth on the smartphone: Open the smartphone's settings menu. Locate and select the "Bluetooth" option. Toggle the Bluetooth function to turn it on.
3. Pairing the devices: On the smartphone, under the Bluetooth settings, it will start scanning for nearby devices. Select the scanned Bluetooth earphone from the list of available devices. The earphone's name or model number typically appears on the list. Tap on the earphone's name to initiate the pairing process.
4. Complete pairing: If required, enter a passcode or PIN (usually mentioned in the earphone's manual) on the smartphone to pair with the earphone. Once the smartphone recognizes the earphone, it will establish a connection. The Bluetooth LED indicator on the earphone might turn solid or change color, indicating a successful pairing.

After successful pairing, the Bluetooth earphone will be connected to the smartphone, and audio from the phone, such as calls or media, can be transmitted to the earphone wirelessly. The connection will automatically be established when the earphone is turned on and within range of the smartphone, as long as the Bluetooth function is enabled on both devices.