[WalterBright]

I've found that Skype has much better voice quality than land lines. Skype > land line > cell line.

I dislike longer conversations over the cell phone because of the poor voice quality. It's a big reason why I keep my land line.

[therein]

You need to make sure the person on the other side is also using a landline, though.

Also, Skype is great when both parties have sufficient bandwidth for whatever codec it opts when it detects a high quality data connection but it simply sucks when it detects poor connection, gets worse than Google Hangouts does.

[hammock]

If you've ever worked in an office with VoIP phones, you know that the level of high quality audio is eerie. It's almost too real to seem like a phone call.