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Text messaging is the transfer of short messages between two or more fixed or mobile devices. Text messaging devices include mobile phones, pagers and personal digital assistants (PDAs). Text messaging originated with the short message service (SMS), which was derived from radiotelegraphy. Today, text messaging is a critical global communication medium.
Because the length of text messages is usually limited to 140 bytes (or 160 seven-bit characters), many words are replaced with numbers and single letters, such as “r u ok” (Are you okay?) and 143 (I love you.).
Example of users and uses of text messaging includes: