Design theory: The initial experience of mobile phone interaction design

Flash has not updated for six months, is really sorry the audience. No excuses, only apologies, 90-degree bow (lasts 30 seconds) ...

This six months in the adjustment work content, from the Internet web page interactive design gradually to mobile phone interactive design, not bewildered do wireless business system interaction designer. Mobile phone on the interactive design of WAP1.0, WAP2.0, mobile phone terminal software Three, which is the most complex mobile phone terminal software, its complexity is no less than desktop software, different platforms, different mobile phone hardware created a terminal software n version of the situation, Each version has different environment and brand consistency, which has a more comprehensive requirements for designers.

A brief look at the list in my mobile phone (Nokia5300/s40 third edition) shows that Nokia's experience is also inconsistent.

"First list" communication record, common contact
The default focus for the list is in the first row.
Press the UP ARROW key, the list scrolls up, the last row of the list appears in the first row, and the focus position is unchanged.
Press the DOWN ARROW key at this point, the list does not move, and the focus moves down one line.

"Second list" SMS list, Folder List, most of the list
with scroll bars.
The default focus for the list is in the first row.
Press the UP ARROW key to scroll to the bottom of the list, focusing on the last row of the list.
Press the DOWN ARROW key at this point, and the list scrolls to the first row, and the focus is in the first row of the list.

"Third list" Call history
The appearance of the first list + the interaction of the second list = List of the third type
The same appearance but not the same interaction, at least at this point will be inconsistent with user expectations.

And I'm not trying to figure out why it's so designed, but there's also a puzzling place:
Nokia S40 and S60 two platform of the English interface is called "Options", but the Chinese S40 under the "Operation", S60 called "Options."
Why? Who can tell me?