The Sony Ericsson P910 is a smartphone by Sony Ericsson introuced in 2004 and the successor of the Sony Ericsson P900. The P910 has a full QWERTY keyboard on the back of the flip (the flip can also be removed completely, allowing for a 'traditional' PDA form-factor.) The biggest change from the P900 to the P910 is that the P910 now supports Memory Stick Pro Duo and the phone's internal memory has been upped from 16MB to 64MB. Although Memory Stick Pro Duo comes in larger capacities, the maximum supported by the P910 is 1GB owing to performance lags. It is powered by an ARM9 processor clocked at 156MHz and runs the popular Symbian OS with the UIQ graphical user interface. Also, the touchscreen displays 262,144 colours (an 18-bit colour depth) , as opposed to the P900's 65,536 (16-bit). It comes in three versions: