The T-Mobiles Samsung Galaxy S II is also known as "Hercules" - this devices comes with 4.52 inches display screen with a little bit more curved in the four corners body unlike the size of Galaxy S2 Sprint D710 and Galaxy S2 AT&T which has 4.3″ only, so do the SGS2 GT I9100 International version. But still it uses Super AMOLED Plus Capacitive Touchscreen with TouchWiz UI v4.0 and protected with scratch-resistant surface via Corning Gorilla Glass Display. For the screen resolution, and equipped with WVGA touchscreen in (800 x 480 pixels) pixel resolutions. Isn't it nice!
We'll here's your T-Mobile Samsung Galaxy S II t989 User Manual - T989_English_User_Guide.pdf
Samsung Galaxy S II SGH-T989 by T-Mobile User Manual