1. Convenience: Many people have their mobile devices with them at all times, making it convenient to send and receive sign requests via SMS or WhatsApp.
2. Speed: SMS and WhatsApp messages are typically delivered and read quickly, making them ideal for time-sensitive sign requests.
3. Accessibility: SMS and WhatsApp messages can be sent to anyone with a mobile device and a phone number, making them accessible to a wide range of individuals.
4. Cost-effectiveness: SMS and WhatsApp messages are often more cost-effective than other methods of communication, such as phone calls or traditional mail.
5. Record-keeping: SMS and WhatsApp messages can be easily saved and archived, providing a record of the sign request and the response.
6. Security: SMS and WhatsApp messages are often encrypted, providing a level of security and privacy for sensitive sign requests.
7. User-friendly: SMS and WhatsApp are both widely used and user-friendly, making it easy for individuals to send and receive sign requests without needing specialized knowledge or equipment.

Overall, sending sign requests via SMS or WhatsApp can save time, money, and provide a convenient and secure way to obtain signatures quickly and efficiently.