Message from HTC support:
"Thank you for your email to HTC Technical Support about the Sprint Touch Pro2 and using conference calling.
Unfortunately, Sprint opted to re-vamp the conference-calling feature on the device. To use the calling feature I am including and attachment that provides instructions on how to use the Straight Talk feature.
You can also visit www.htcwiki.com for more self-help and a survey. "
The document that was sent basically is a copy/paste from the user-manual talking about 3-way conferencing. I would have liked this feature which was a strong selling point.