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It used to be the 2.5 mobile phone.
1 answer
3.5 mm (If you are satisfied with my reply, please click "Good Comments" at the bottom left corner, thank you for your adoption.)
It's 3.5mm. I hope it's useful for you
5 answers
Standard 3.5 mm
The current mobile phones are all uniform 3.5mm
4 answers
3.5mm
It's a normal headphone hole, universal.