: Users can check their calendar or lookup contacts directly while on a phone call.
: Includes essential tools like a Calendar , Calculator , World Clock with alarm, Tasks (To-do list), Memos , and Contacts .
The Treo 650 software is based on , which integrates standard PDA productivity tools with advanced mobile communication. A defining feature of this version was its support for a wide library of third-party applications, ranging from games to specialized business utilities . Core Software Applications
: Allows seamless two-way data synchronization between the Treo and a PC or Mac using Palm Desktop software , ensuring that contacts and schedules are updated on both devices.