What is said about the Sony ST23i is that it is codenamed Tapioca DS, where DS stands for dual-SIM functionality. Other than that, the device is expected to be identical to the Sony ST21i Tapioca, with a 3.2-inch HVGA display, 800MHz single-core processor, and a 3-megapixel camera being among its rumored specs. The hardware configuration of the Sony WT23i should be pretty similar as well, but the device is expected to be marketed under the Walkman brand instead.
As you can see from the benchmark results below, the two smartphones are not meant to set new Quadrant high scores. Instead, it would be more likely to see them marketed in emerging markets, or as affordable pre-paid offerings. If they ever get to see the light of day, that is.
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via: Xperia Blog