While Truphone used to have free calls to the PSTN until recently-but only for those who signed up at the beginning-new customers can get in on some free call action as well.

Well, ok, it's only $8 USD, instead of the usual $2 credit for new signups. And it's only for a limited time (offer expires at 0:00 BST 11 July 2008). But still, that's still 133 minutes to customers in the Tru Zone, which includes landlines in 40 countries as well as mobile phones in the U.S. and Canada.

While WiFi calling from a compatible Nokia handset is a cool thing-when you have a wifi connection available-I'm waiting for the Truphone SIM card. Won't be as cheap as WiFi calls, but loads more convenient.