Manufactured for O2 by Benq (in common with the X2 and X3 handsets), the X1i can very broadly be thought of as a bargain rival to the Vodafone-branded Sharp GX15.
This is about as basic as camera phones get, with a 352x288 pixel camera, combined with a 128x128 pixel 65,000 colour display. Benq are proud of the display panel in the O2 X1i, citing their "Transmissive Micro Reflectance" technology, presumably a type of transflective display.
Layout is simple and functional, with a large 5-way navigation key. There's an anti-slip stripe around the edge to make the O2 X1i easy to grip. The X1i is a tri-band GSM phone with class 10 GPRS, a WAP 2.0 browser, MMS and polyphonics. It's light too, at just 86 grams, and fairly slim at 18mm thick.