Which smartphone introduced Palm's webOS in 2009?

Which smartphone introduced Palm's webOS in 2009? It was the Palm Pre. Palm unveiled the Pre and its new Linux-based webOS at the 2009 Consumer Electronics Show, presenting the phone as a modern successor to the company's older Palm OS devices.

The Palm Pre reached U.S. customers through Sprint on June 6, 2009. Its standout hardware feature was a portrait-oriented slide-out QWERTY keyboard beneath a touchscreen. webOS introduced a card-based multitasking interface, letting users view open apps as cards and swipe them away to close them.

Another major feature was Synergy, which combined contacts and information from services such as Google, Yahoo, Facebook, LinkedIn, and Microsoft Exchange into unified lists. That cloud-oriented approach helped distinguish webOS from traditional desktop synchronization systems associated with earlier Palm handhelds.

The Palm Pixi was a later, smaller webOS phone, not the platform's debut device. The Pre was followed by models including the Pre Plus and Pre 2, but modest sales and slow hardware and software expansion contributed to Palm's eventual acquisition by HP.