I have used skype for a year or so now and with the increased BB speed the quality is excellent.
I too have just gone to a Dualphone as mentioned previously in rthe thread and find it excellent.
I have a answerphone set up in case I miss any calls from my contacts. Its free and was produded by Kishkish.co.
I use Skype out credit and find it the cheapest soln for me-even compared to a Prepay system like http://www.easycall.co.nz
I try and get all my mates on it which of course snowballs and enables you to call them free too.
Plus I have skype installed on my WM5 device-Imate jasjar and and use it either wifi or even on GPRS connection.
All in all I am very pleased with it
Chris
Hamilton

