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:

• Advertising: Contests and promotions
• Family members, friends and classmates: Keeping in touch
• Groups or organizations: Activity communication
• Political campaigns: Updates to constituents
• Vendor system automation: Ordering products and services
• Vendors: Payment due dates and other notifications