Making long distance or international calls from your mobile phone can be so expensive that it's almost better to not stay in touch. Install Nimbuzz on your Pocket PC, and you'll be able to talk to people all over the World for free - at least in theory.
Nimbuzz allows you to make calls, chat online, exchange instant messages and send files from your phone for free. The application pulls all your contacts together in one place, so you can exchange messages with all your friends on networks such as MSN, AIM, Yahoo! Messenger, Google Talk, Jabber, Facebook, or MySpace.
The user interface combines all of your contacts from all these various networks into one place, and you can see who is online at any time. If you want to get someone's attention, you simply 'buzz' them, and Nimbuzz will be launched on their phone.
Of course, all this talk of 'free' long distance calls and messaging is a little misleading. That's because you'll still get charged for Internet access when using Nimbuzz. This is fine if you're using a WiFi connection or if you have a flat-rate data plan, but if you pay for data by the Mb then using Nimbuzz could work out to be very costly if you're not careful.
However, if you have a flat-rate plan, Nimbuzz makes for a fun and cheap way to stay in touch with friends and family around the World.