Skype has been hunting for the right application to run on Windows Mobile smart phones and has now developed it themselves in Skype 2.2.  The new client will enable Skype calls to be made over 120 different Smart Phones in existence already through Wi-Fi networks using Skype’s VoiP service.

Under a beta plan users will be able to make free calls to other Skype users.  Users can also utilize their Skype in and Skype out accounts to make and receive calls to landline phones as is available with normal skype products that are not resident on cellular devices.

Skype was previously available on Pocket PC devices.  Over 5 million Pocket PC device downloads have occurred under that service plan.