My iPhone 8 Plus keeps giving me notification sounds (the Tri-tone) why?

My iPhone 8 Plus keeps giving me notification sounds (the Tri-tone) and don't have that tone set for anything. Sometimes it does it twice in a row. I've reset the phone. Why is it doing this?

Try resetting all settings under general-->Reset-->reset all settings.

Does the device still do this when you toggle the vibration button on the side of the phone on?

In your notifications settings, have you checked each individual setting for each function in your device?

If this isn't helpful, I'd recommended chatting with Apple Support online. You can chat or call them at 1800 APL CARE

They pick up fairly quick.

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