My old flip phone used the earphone as the antenna. The radio wouldn't work without it plugged in. EDIT: It was a Nokia 6086, and the radio was an FM receiver.

My old flip phone used the earphone as the antenna. The radio wouldn't work without it plugged in. EDIT: It was a Nokia 6086, and the radio was an FM receiver. https://www.gsmarena.com/nokia_6086-1798.php https://www.gsmarena.com/nokia_6086-1798.php https://www.phonescoop.com/phones/phone.php?p=1138 https://www.phonescoop.com/phones/phone.php?p=1138