The Gizmo Project, a Voice Over IP internet telephony application, is now working on Palm phones, Nokia phones and Nokia UMPCs. Gizmo calling is free device-to-device and very cheap device-to-phone -- overseas too!
If you have been waiting for a good VoIP client for your device (like the long-rumored Skype), your wait is over.
BTW, you don't need VoIP on your device to gain the low cost of VoIP. Simply sign up for
Jajah. With Jajah you can initiate the call using the Jajah website (no client app on your device!) and Jajah will ring your phone and the phone of the party you are calling. That's right! You call phone-to-phone at startlingly low rates -- better than phone cards. Even better, if you have an internet enabled mobile phone, you can initiate your call on Jajah's website using your phone. Then, if you aren't paying airtime for incoming calls (like me in China) using Jajah on your cell phone is just as inexpensive as using a land line.
With Jajah, you can call member-to-member free up to 19 minutes a week!