Why would people want VoIP client on a handheld that is already a cell phone? VoIP clients can provide additional enhanced services specific to your organization, lower your per call costs and even provide you with unlimited minutes as long as you have unlimited internet access.

You know I don’t like Skype much, but it has to get it’s due. Skype has a version for Windows PocketPC that works on Windows Mobile. You can download the software for free from here.

Wifive323 is another soft phone for Windows Mobile. Wifive323 is available for download for free but the free version has an annoying beep every 10 seconds. Wifive323 can be downloaded from here.

SJPhone is available for PC or for mobile devices. This means if you use the same client on your PC and your handheld, you won’t need to learn a new interface. SJPhone can be downloaded from here.

Before you go about installing any of these clients, be sure your handheld has enough processing power.