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Technology culture

In Japan, mobile phones became ubiquitous years before the phenomenon spread worldwide. In Japanese, mobile phones are called keitai denwa (携帯電話), literally "portable telephones," and are often known simply as keitai (携帯). A majority of the Japanese population own cellular phones, most of which are equipped with enhancements such as video and camera capabilities. As of 2018, 65% of the population owned such devices. This pervasiveness and the particularities of their usage has led to the development of a mobile phone culture, or "keitai culture," which especially in the early stages of mobile phone adoption was distinct from the rest of the world.

as of 2013, the Japanese mobile phone market is broadly divided into a high end, consisting of smartphones (スマートフォン (sumātofon), abbreviated as スマフォ (sumafo) or スマホ (sumaho)); mid range, consisting of feature phones (garakei); and a low end, consisting of Personal Handy phone System (PHS, handy phone (ハンディフォン) or (ピッチ), from PHS (ピーエッチエス)). There is some overlap of market segments between low end smartphones and high end feature phones, and many shared features. PHS, which was initially developed as a cheaper alternative to 2G networks such as CDMA and GSM, was initially deployed in 1995, but is now only offered by one carrier, Y!Mobile (part of SoftBank). As elsewhere in the world, smartphones have been growing rapidly.

The use of mobile phones to make calls on public transport is frowned upon, and messages asking passengers not to make calls and to switch their phones to silent mode ("public mode" or "manner mode" in Japanese) are played frequently. This, combined with the low per message price and ample allowed length per message (10,000 characters), has increased the use of text messaging as an alternative to calls. Abbreviations are also widespread. '\' 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) could be used to imply that the student did not study enough, or that the test itself invites negative emotion. Some of these usages disappeared as suitable emoji were made, but these newly made icons also acquired a usage not originally intended. One 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 coloured on most cell phones, to make them more distinct. ASCII art is also used widely and many of them are faces with expressions. (see also Shift JIS art)

Emoji, originating on Japanese mobile phones in 1997, became increasingly popular worldwide in the 2010s after being added to several mobile operating systems. They are now considered to be a large part of popular culture in the West. The SkyWalker DP 211SW, a mobile telephone manufactured by J Phone which supported a set of 90 emoji, was the first phone known to contain a set of emojis as part of its typeface, dating back to 1997. The J Phone DP 211SW didn't sell well due to its high retail price, and therefore mass market adoption of emoji didn't take place at the time. J Phone later became Vodafone Japan and is now SoftBank Mobile; a later, expanded version of the SoftBank emoji set was the basis for the emoji selection available on early iPhones. and deployed on NTT DoCoMo's i mode, a Mobile web platform. They were intended to help facilitate electronic communication, and to serve as a distinguishing feature from other services. It included the Face with Tears of Joy emoji, which represents a Japanese visual style commonly found in manga and anime, combined with kaomoji and smiley elements. An additional 76 emoji, besides the 176 basic emoji, were added in phones supporting C HTML 4.0.

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.

A cell phone novel, or , is a literary work originally written on a cellular phone via text messaging. This type of literature originated in Japan, where it has become a popular literary genre. However, its popularity has also spread to other countries internationally, especially to China, the United States, Germany, and South Africa. Chapters usually consist of about 70–100 words each due to character limitations on cell phones.

In the early 2000s, mobile games gained mainstream popularity in Japan, years before the United States and Europe. By 2003, a wide variety of mobile games were available on Japanese phones, ranging from puzzle games and virtual pet titles that utilize camera phone technology to 3D games with PlayStation quality graphics. Older arcade style games became particularly popular on mobile phones, which were an ideal platform for arcade style games designed for shorter play sessions. Graphics improved as handsets became more powerful, as demonstrated by the mobile version of Ridge Racer in 2003, though such titles typically cost twice as much as other mobile games. Ridge Racer was published by Namco, one of the most successful mobile game publishers at the time. That same year, Namco also released a fighting game that uses camera phone technology to create a player character based on the player's profile, and interprets the image to determine the character's speed and power; the character can then be sent to a friend's mobile to battle. Namco began attempting to introduce mobile gaming to Europe in 2003. The Japanese market today is becoming increasingly dominated by mobile games, which generated $5.1 billion in 2013, more than traditional console games in the country.

Phone decorations are common, notably mobile phone charms and various stickers. The stickers are often in the maki e style, and are advertised as such.

There is a popular trend in Japan to use the mobile phone handset to read information from special barcodes. The current technology is based on 'QR codes' which are a form of 2D barcode that is written out in a square shape instead of a bar shape. The phone handset can scan the QR code using its camera or other input, decode the information, and then take actions based on the type of content. The most popular usage of these QR codes is in advertising. All over Japan there are posters with the codes on and they are found extensively in magazines and even on some people's business cards. The QR code usually has links to a web site address or email address that the phone can access, or it might contain address and telephone numbers. Sony, working with NTT DoCoMo, has been spearheading the mobile phone wallet technology, commonly known as 'FeliCa'. This technology makes use of an RFID chip inside the handset that can communicate with reading devices when the phone is placed near them. Though the technology is relatively new, there are many locations such as convenience stores which allow users to pay for goods using their phones; some vending machines even accept phone payments. Users must 'charge up' their accounts with credits before they can pay using their phones. The Ubiquitous Business Department of NTT DoCoMo is developing the technology for a mobile phone to be the purchase system for virtual shops and smart shops, an authentication system in the medical field, and the purchase point for street poster advertisements. Gracenote and Media Socket have a service where the user can hold the phone up to a source of music (such as a speaker), and, by dialing a certain phone number, find the song in a database and have it identified. The user receives the song's title, artist, and album within seconds. This information can in turn be used to search the mobile Internet to find that song. Many of these technologies are now common place throughout the world thanks to the rise of smartphones, such as Android and iOS devices.

The modern selfie has origins in Japanese kawaii (cute) culture, which involves an obsession with beautifying self representation in photographic forms, particularly among females. By the 1990s, self photography developed into a major preoccupation among Japanese schoolgirls, who took photos with friends and exchanged copies that could be pasted into kawaii albums. The digital selfie originates from purikura (Japanese shorthand for "print club"), which are Japanese photo sticker booths. Video game companies Sega and Atlus introduced the first purikura in February 1995, initially at game arcades, before expanding to other popular culture locations such as fast food shops, train stations, karaoke establishments and bowling alleys. Purikura became a popular form of entertainment among youths in Japan, and then across East Asia, in the 1990s. It stored up to 20 JPEG images, which could be sent over e mail, or the phone could send up to two images per second over Japan's Personal Handy phone System (PHS) wireless cellular network.

It is considered a violation of good etiquette to answer a cell phone in certain public places. For example, on trains it is rude to answer or talk on cellphones. Many people keep their phone in 'manner mode' (silent mode) in order to not bother others and to avoid embarrassment on trains. On the other hand, writing emails or playing games with a cell phone while riding the train is completely acceptable. Electromagnetic energy is theorized to cause interference with heart pacemakers and other medical devices. Most trains contain signs demanding that mobile phones be turned off when around seats reserved for the elderly and handicapped, but passengers rarely do so. In hospitals, it is expected that one should turn it off entirely. Both talking on the phone or texting/messaging while operating a vehicle or riding a bicycle are prohibited, but nevertheless remain fairly common.