One is using it every day right now. UK landlines and US/Canada landlines and mobiles all for c 6 quid a month. I've never figured out how to get Skype on my mobile Mortorola Cliq XT with an early Android OS. So old it seems it's not worth trying as I rarely find I can make much sense of it.
My son in Texas and daughter in London both have Skype on their phones, and I've had quite good contact quality like that. I'll perhaps start a thread on it so as not to hijack this one anymore.