Maybe your device doesn't recognize headphones, due to a software conflict. All you have to do is to restart your device.
In order to restart your device, press and hold the Power ON/OFF (Sleep/Wake) button until a slider appears and move the slider to the right to power off the device.
Press and hold the Power ON/OFF (Sleep/Wake) button again after 10-15 seconds, to turn on the device.
Note: You can also perform a force-restart, by pressing and holding the Home and the Power ON/OFF buttons.
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