The Sony Ericsson P1 is a smartphone and the successor of the P990. It was the last of the Sony Ericsson "P" Smartphone series, introduced in 2002 with the Sony Ericsson P800 and it integrates many of the hardware features of its predecessor the P990 in the form factor of the M600. It was announced on 8 May 2007. There is a Chinese version of P1 called P1c. Compare with P1/ P1i, P1c lacks of 3G, thereby using EDGE which is much slower but more available especially in the US and parts of Europe. The phone uses the UIQ 3.0 software platform, which is based upon Symbian OS 9.1. It is slightly thicker than the M600 as a result of the new hardware features, but this is reportedly largely indiscernible. It is nonetheless considerably thinner than the P990 (25% smaller - as the official press review states). Key improvements As a result of its increased RAM, the P1's multitasking performance is more stable than that of the first batch of UIQ 3 phones from Sony Ericsson (P990, M600 and W950). The boot speed, when compared to the P990, is also discernibly faster. The P1 uses the form factor of the M600 and consequently shares its screen size of 2.6 inches, making it 0.2 inches smaller than its predecessor. However, due to the new transflective layer on its LCD display, legibility under direct sunlight has been improved on the P1. This addresses a common problem faced by owners of the P990. The phone has 256 MB of ROM; twice as much as its predecessor. The P1 also has 160 MB of built in storage, which can be expanded by up to 16 GB using its Memory Stick Micro slot. Main features 3.15 MP camera with autofocus, Video - QVGA 320x240 15fps, LED flash, 3X digital zoom, Business Card Scanning and Picture Blogging Rocker QWERTY Keyboard with two letters sharing on one key (key pressed left for one letter and right for the other letter) Video Telephony (uses both front and back cameras) 256 MB Flash, 160 MB user free memory 128 MB RAM (79 MB free on startup) Symbian OS v9.1 UIQ 3.0 512 MB Memory Stick Micro (M2) bundled on package OptiMobile VoIP client (not included) FM Radio with Equalizer & RDS support (AF, TA, NEWS), Gracenote TrackID service Enhanced standby screen - can have up to 15 applications shortcuts