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I have no sound coming from my phone unless the headphones are connected. Tried all of the suggestions online and even factory reset the phone and still nothing
As you seem to have tried everything Suzy I'd suggest you contact Samsung and have them take a look at the phone, contact Samsung UK here.
I had this problem it's as if the headphone jack port thinks there is still headphones in its temperamental so I muck about with them till it works.