how to play music in speaker when headset is connected

Solution
You might be able to do it through Bluetooth with a suitable speaker but the headset socket is set to cut the phone's own speaker as soon as it's put to use.

audie-tron25

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Mar 23, 2015
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Although it may not be possible to do what you are trying to do, you could also get a 3.5mm splitter and connect your headset AND another speaker to it. Is this iOS or Android (or something else)?