What size is the headphone jack on the LG 505c?


I agree in the mm size but have had problems with headsets not having enough volume for me. I'm old. the Cellnet 3.5 Boom Mic Headset volume is way too low.
My volume button on my phone is 100% and I see no place to turn up the volume on the headset except a small switch near the ear bud and it does nothing.
Can you help?
Is this a fail purchase and if so which would you prefer for an old man on the golf course.

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