I provide FogBugz training and spend quite a lot of time on the phone to the USA. I prefer to use my mobile phone with its headset but I really don’t like paying £ 1.76 per minute or whatever it is. I don’t even know what 02 charge me because I can’t understand their tariff. This is of course their objective.
Today I installed Skype for Android on my phone and purchased some Skype credit. This gives me calls to the USA at ~ 1.5 p/min.
It seems to work and I will update this post as I learn more.