My wife and I have iPhones and I installed Truphone on them. Unfortunately calling iPhone to iPhone isn't free even when both have Truphone installed. Here's the response I got back when I asked them about it.
"The Truphone service for the iPhone is an outbound calling solution. When
you're connected to Truphone you're able to make cheap Truphone calls over the Internet. Please note that inbound calls will be received via your mobile/cell network and not via Truphone.
New Truphone accounts for the iPhone won’t be assigned a separate Truphone number. Instead your outgoing caller id will be presented as your
mobile/cellular number that you entered during the installation process.
Calls to other Truphone users who are using Nokia devices are free when both parties are online!!"
I was in Berlin yesterday and used part of the $4.00 they gave me when I signed up to call home and it worked great. I was using a free wifi connection from a Haagen-Dazs. Not bad.
