Reported Issues: Phone Does Not Ring when receiving phone call
Some people are reporting that their Treo 750 will not ring when receiving a phone call. Apparently, Palm is aware of the issue and will be providing a fix. We can neither confirm or deny this report.
There seems to be a couple temporary fixes for this. Some people are reporting that if you turn off Voice Command this issue goes away. Others say you can go to “Settings”/”Sounds+Notifications”/”Phone - Unknown (or known)” - then switch from “Ring” to “Increasing Ring”.