Skype for Windows Mobile
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Full user review
"Works great on HD2"
Simple to install & use.
Works over Wi-Fi without any delay or sound issues.
Have to install using a PC.
I used it to make a four way conference call with two of the parties in the Caribbean. Didn't have any delay or sound issues using it on Wi-Fi. I could still post to twitter and check email with my phone freezing or locking up. Best if you use headset while on the call.