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The Sony Ericsson K850i is a high-end mobile phone released in October 2007. It was announced in June 2007 as the flagship product in Sony Ericsson's K ("Kamera") series, with a 5 megapixel CMOS camera sensor. The K850 will be the first Sony Ericsson phone released outside of NTT DoCoMo to support microSD and microSDHC along with Sony's traditional M2. It also introduces the usage of three touch-sensitive softkeys right under the display and a new form of navigation button, omitting the classic joystick introduced with the Ericsson T68. The camera interface has been revamped to resemble the format of cybershot digital cameras. According to the manufacturer the UMTS talk time has been significantly increased to 3 hrs 30 min over its predecessor, the K800 and K810. [1] (K800 2 hrs 30 min). It was Sony Ericsson's first 3.5 HSDPA supporting mobile phone, and was also the first 3G "global" mobile with supporting all major operating network frequency in the world.

==Design and features==
The phone introduces a new button in the Cyber-shot line: on the right side a switch allows to choose between photo, video and playback mode.
The phone is available in the colours "Luminous Green", "Velvet Blue" and "Quicksilver Black".

Key features include:
* [[3G]] video calling
* [[Cyber-shot]] 5 megapixel Camera with [[Xenon]] flash and additional 3 LED flash for video recording
* [[Bluetooth 2.0]] (100m)
* Web Access ([[NetFront]] browser included)
* Exchange ActiveSync
* [[3.5G]] high speed internet ([[HSDPA|Support up to 3.6Mbit/s (download speed), 384kbit/s (upload speed)]])
* Multiple audio playback ([[Advanced Audio Coding|AAC]], [[WAV]], [[MP3]], [[Windows Media Audio|WMA]])
* Built in Media Center (Sony PSP/PS3 XrossMediaBar menu)
* Video player with progressive fast forward and slow motion
* Memory Stick slot to expand the memory to up to 4GB.