The Siemens S55 is a compact candy-bar style phone with a basic feature set that puts it in the mid-level of the market. With a complement of useful functions but lacking in features common to higher end phones (such as built-in camera, high-res display, etc.), the S55 packs more than an average basic phone into a smaller-than-average package.
This phone shares many of the core circuit components with other Siemens models, such as the Infineon PMB7850 single-chip baseband processor IC and the Htachi RF Transceiver. Siemens has developed a solid and proven core platform for most of their products based on these building blocks.