Rather than the usual square LCD, the K790’s 1-1/4 x 1-5/8 inch screen is more radically oblong, handy for both viewing long menu 
lists and as a wider viewfinder for the digital camera. Thanks to Sony’s Scalable Vector Graphics software, both images and text are rendered smoother, crisper, cleaner, and more readable than we’ve seen on any screen, which is fortunate, because the phone’s web text is the smallest we’ve ever seen (even smaller then the text you squint to read in classified ads).
The screen length makes the 4.1-ounce K790 a bit longer (4.1 x 1.8 x 0.9 inches) and leaves little room for the cramped keypad and navigation array. One compromise for the lack of key real estate is the absence of dedicated "send" and "end" keys. When "dialing" a number (we really need to find a more precise euphemism for entering a phone number in this touch-tone age), the "send" command is a soft key; ditto for the "end" key when you’re in mid-call. While functional, this does take a bit of getting used to. There’s also no "home" key; holding the "back" key for a couple of seconds brings you back home. There is a dedicated "c" key, however, which seems to act only as a rarely-needed “delete” key.
There are two tiny direct function keys on either side of the navigation array: one for web access and a tiled page icon key that brings up tabbed function and application lists. A small recessed joystick makes menu navigation simple.
Sony Ericsson K790a Review - Full Review - Cell Phones, PDAs, GPS - Cell Phones - I4U Reviews provided by Digital Trends