Just found that:
Japanese mobile phones have the capability to use very large sets of characters and icons based on JIS standards that define characters for industrial appliances. More than one thousand characters including all of the Latin alphabet, hiragana, katakana, kanji and special characters like cm (centimeter), arrows, musical notes and more can be used to compose messages. Japanese mobile phones also use emoticons differently from Western mobile phones (see Japanese emoticons).
These character sets are used extensively, and often in a way that do not use their original meaning by relying more on the information based on the shape each character has. For example, '\' may be attached at the end of a sentence to show that they are not happy about the event described. A sentence like "I have a test today\" (translated) might mean that he or she didn't study enough, or that the test itself is depressing. Some of these usages disappeared as suitable icons were made but these newly made icons also acquired a usage not originally intended. Another example deals with the astrological symbol for Libra (♎). It resembles a cooked and puffed mochi, and is sometimes used in a happy new year's message as mochi are often eaten then. The symbol for Aquarius (♒) resembles waves, so this would be used to mean 'sea'. The number of icons gradually increased and they are now colored on most cell phones, to make them more distinct. ASCII art is also used widely and many of them are faces with expression. (see also Shift JIS art)
Gyaru-moji
One very distinct form of writing is called 'gyaru-moji ('gal characters' named after the fashion style 'gyaru' or 'gal' because the people of this fashion style are the ones who often use this kind of lettering). For example Lt wouldn't correspond to the Latin characters 'L' and 't' but instead it would correspond to the hiragana, け ('ke'). Notice that it looks very similar when written. Many hiragana, katakana and kanji are taken apart and reassembled using different characters including alphabet characters. It is unclear why this usage is now seen. Some believe that this started as a way of making secret messages that a quick peek wouldn't reveal, while others claim that it was just for fun. This can be related to the way the English language hacking culture uses 1337 language to hide the meaning of the words typed. It is also possibly due to different character limits when different languages are used, e.g. 160 Latin characters and 70 Unicode (inc. kanji). By splitting the characters into alpha-numeric characters, it extends the possible over-all length of the message.
Teenagers and mobile phones
Paging devices used in the late 1980s to early 1990s predate mobile phones and paved the way for the popularity of the phones among teenagers. Pagers could only display numbers and were intended to alert the owner that he or she had received a call from a certain phone number, but teens quickly began using numeric messages to communicate everything from greetings to everyday emotions. Most were based on various ways numbers could be read in Japanese. Examples are
* 4-6-4-9 -- yo-ro-shi-ku ("hello," "best regards")
* 3-3-4-1 -- sa-mi-shi-i ("I feel lonely")
* 8-8-9-1-9 -- ha-ya-ku-i-ku ("hurry up, let's go")
With the rapidly falling prices of cell phones in the mid 1990s, young people began experimenting with the short message service that the mobile phone companies started offering. When the i-mode service became available, the mobile phone culture began flourishing in earnest as this service offered an E-mail application. Magazines and television regularly make specials focusing on the current trend of how mobile phones are used by young people.
(by wikipedia)
long but ineresting!! O.O

I want to have this mobile phone *.*
Perfect machine for comfortable watching of fanservice on the busway to school :D