Free Mobile Program

Skype for Windows Mobile allows you to make free Skype-to-Skype calls using a 3G or WiFi connection.
This mobile version of the Skype VOIP client also lets you call phones with Skype credits, as well as allowing you to receive calls on your online number, send instant messages, share files, and more.
Using Skype on your phone is dead easy. Once launched, the program gives you all sorts of warnings to notify you that it will be using your mobile Internet connection. Then it's just a case of signing in with your regular Skype account details to get started.
Your contacts will all be imported and displayed in the main window, along with details of their statuses. To call a person, just tap on their name and hit the phone icon. The call quality in our tests was excellent, and as long as your connection is stable you shouldn't experience any drop outs.
Instant messaging features
The IM feature in Skype for Windows Mobile is easy to use and includes a range of emoticons, templates for one-click replies, file sharing, and the ability to add other participants to the conversation. We did note a few lags in the time between the messages being typed and arriving at their destination.
Skype keeps a record of all your text conversations, as well as logging your call history, voicemails, and files exchanged. You can view this information at any time just by clicking the 'History' button from the well-organized main menu.
Skype settings
There are a few settings you can tinker around with that help you personalize your Skype experience. For instance, you can choose to enable or disable the Mood message prompt, forward calls to another number, and block calls from people you don’t trust.
If you're expecting a fully-fledged version of Skype that has all the features of the PC or Mac version of the program then you'll be a little disappointed. There's no video conferencing or games, for example, and there are no tools for organizing your contacts into categories.
Sadly, Skype is no longer officially supported for Windows Mobile and the developer says it has no plans to release more updates for Windows phones in the future. However, you can still download the app from Softonic and use it for free.

It’s worth trying, because Skype for Windows Mobile offers everything you'd expect from a mobile version of the great VOIP app - it's easy to use, it's fun, and it's free!