cheap international calls and roaming

Hi,
I am French and I work in London.
Just want to let you know guys that you can call home for less, using international access numbers or roaming SIM cards.
I give you 2 websites for cheap international calls from a mobile or landline (you can buy credit online and use it to make cheap calls from different countries, not only UK):
www.best4talk.co.uk
www.storytelecom.com
There are the cheapest international calls services providers I found on the web.
Note that you can also get a roaming SIM card (almost free). Check out on Story Telecom website for this great offer: www.storytelecom.com/traveltalksim/
Now you can call home more often ;-)
Hope this helps!
B.