Andrew over at Treonauts has tested the latest patch for Unlocked GSM Treo 650’s. If you have an unlocked 650, be sure to get the latest patch here.
If you are using any other providers, do NOT use this download, there are separate releases for Verizon, Sprint or Cingular. But do yourself a favor and make sure you’re using the latest patches, there have been many updates to this phone that will give you a more stable OS and better voice quality, among other things.