スマホ

• Reading: スマホ
• Romaji: sumaho
• Kanji breakdown: From English 'smartphone' → スマートフォン (sumāto fon) → abbreviated to スマホ (first two mora of each word)
• Pronunciation: /su.ma.ho/

Meaning

Abbreviated form of スマートフォン (sumāto fon, 'smartphone'). The standard everyday word for smartphone in Japanese.

スマホ has completely replaced the full form スマートフォン in daily conversation and is understood by virtually everyone in Japan. It is used so universally that most Japanese people would not even consider it slang — it simply is the word for smartphone. The older term ケータイ (mobile phone) now specifically refers to older flip phones or feature phones, while スマホ refers to modern smartphones.

Examples

1. スマホの充電切れそう、モバイルバッテリー持ってない？ My phone's about to die — do you have a portable charger?
2. 電車の中みんなスマホ見てるよね。 Everyone on the train is staring at their phones, right?
3. 新しいスマホに変えたいんだけど高すぎる。 I want to get a new phone, but they're way too expensive.

Usage Guide

Context: daily conversation, media, advertising, all contexts

Tone: neutral, everyday

Do Say

• スマホどこ置いたっけ？ (Where did I put my phone?)
• スマホで撮った写真送って。 (Send me the photos you took on your phone.)

Don't Say

• 公式文書で「スマホ」と書く (In official documents write スマートフォン — スマホ is too colloquial for formal writing)

Common Mistakes

• Confusing スマホ with ケータイ — ケータイ now refers specifically to older feature phones/flip phones

Origin & History

Abbreviated from スマートフォン (sumāto fon), the Japanese transliteration of 'smartphone.' Entered common usage around 2010-2011 as smartphones became widespread in Japan, quickly replacing ケータイ as the default term.

Cultural Context

Era: 2010-2011 with iPhone/Android adoption in Japan

Generation: All ages

Social background: Universal

Regional notes: Used across all of Japan. So thoroughly adopted that it barely registers as an abbreviation anymore.