The 620 is loud in a good way.
The primary speaker rests on the lower side of the back cover.
An array of ringtones and sound alerts will definitely remind you where you left the phone when it rings.
A 3.5mm headphone port is located on top of the phone.
Interestingly, the port is integrated in to the back cover.
So, what that means is, you can not plug in the headphones incase your back cover is missing.
Aided with noise cancellation, we were able to make and receive calls without much distortion.