A business’s Sender ID is what is displayed on the phone screen of a customer when they receive a message from you. This is unique to the organization and creates a way for customers to identify brands.
For example, when you receive an SMS from someone in your contact list, their name is displayed on your phone above the message. Similarly, Sender IDs are displayed on your customers' phone when they receive a message from you.
Sender ID for Promotional SMS is numeric and fixed from the operator itself. For eg. 777222.
Sender ID for Transactional SMS is of 6 character and alphabetic in India. For eg. VALIFY, KALERA.
To know more read our Sender ID documentation.