Peer to peer calling software for mobiles. You can call to any other skype account free of cost from your mobile itself. What you need is a wireless hotspot with internet connectivity or a internet connectivity in your mobile phone.

 They are now supporting windows version and n800 tablet. It have call forwarding, so that you can recieve skype calls while you are not in your table. They have a windows mobile version which can support almost all PDA / Smartphone / Pocket PC running windows mobile versions. Check out the solution http://www.skype.com/download/skype/mobile/.

The requirement sheet are listed below

● OS: Microsoft Pocket PC 2003, Microsoft Pocket PC 2003 Second Edition (SE) or Microsoft Windows Mobile 5.0 Pocket PC
● Display: 240×320, 320×240, 480×640, 640×480, 240×240, 480×480
● CPU: 195Mhz OMAP or 312Mhz Intel
● Network: Wi-Fi, 3G or EDGE