Well,until now I didn't use any Voip software.I tried to use Skype a couple of times but my 320 RAM was not enough for it!Until I discovered
VoipDiscount and
Jajah.They are not the same but I love them both.With Voipdiscount I have 300 min every week for free calls all over the world.And the quality is very good.With Jajah I have to pay something but again it's very cheap if I compare it with my telephone company and the quality is great!