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SMS language, textspeak or texting language is the abbreviated language and slang commonly used with mobile phone text messaging, or other Internet-based communication such as email and instant messaging.
Features of early mobile phone messaging encouraged users to use abbreviations. Text entry was difficult, requiring multiple key presses on a small keypad to generate each letter, and messages were generally limited to 160 characters. Additionally, SMS language made text messages quicker to compose.
Once it became popular, it was often used outside of texting, such as to write formal emails or letters.

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