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Huawei Ascend P1 S side
In addition to the difference in thickness, additional camera software comes pre-loaded on the Ascend P1 S (shown here in side view).
At the outset, Huawei essentially did not plan to produce the slimmer of the two models, a spokeswoman for the manufacturer told ZDNet UK.
"Consumers in the Asian market demand that phones are as thin as possible. When the engineers finished making the P1, they thought, 'How can we make this design more efficient?'" she said. "The 'S' stands for slim."
Most of the reduction in depth came from discovering a new way of making the glass display thinner, according to Huawei.
Image credit: Ben Woods