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).

As a result of its increased RAM, the P1's multitasking performance was far more stable than that of the first series of UIQ 3 phones from Sony Ericsson (P990, M600 and W950).

However, due to the new transflective layer on its LCD display, legibility under direct sunlight has been improved on the P1.

The phone also supports expansion using Memory Stick Micro slot cards, up to 16 GB in size.