Extracted from HowardForum.
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The "speed" of a phone is measured by the time it takes to transfer X MB of data from PC to phone. Fast USB transfer is desirable when transfering large amount of MP3, movie, and tv episol. A phone with Slow USB will require a card reader.

The FASTEST:

W950i: 8.46MB/s
W960i : 8.16MB/s

THE SLOWEST:

W910i: 0.35MB/s
K850i: 0.53MB/s

W950 and W960 use to same USB controller from OTI.
K850i and W910 use to same integrated HS-USB fro EMP Processor.

What's interesting is... All four phone are High-Speed USB and USE v2.0. Yet there is such a great difference is transfer rate.

› See More: Fastest and Slowest SE Phones