High Quality Content by WIKIPEDIA articles! Sony Ericsson Z800i is a 3G mobile phone developed by Sony Ericsson and released in 2005. The Z800i is a phone that is identical to the Vodafone branded Sony Ericsson V800 (or 802SE in Japan). The difference between these two phones is that the Z800i can be found not branded to any mobile phone service provider, and it has different colour variations.