T-Mobile Sony Ericsson Xperia X8. Display diagonal: 76.2 mm (3 "), Display resolution: 320 x 480 pixels. Compatible memory cards: microSD, Maximum memory card size: 16 GB, Internal memory: 128 MB. Data network: GSM, GPRS, EDGE, 3G, Bluetooth profiles: A2DP. USB connector type: micro, Headphone connectivity: 3.5 mm. Audio formats supported: MP3, AAC