What best practices need to be practised for bulk SMS service?

Here are the best practices that need to be followed for bulk SMS messaging;-

SENDER ID:-

ID should be such that it either defines your company name (eg Flipkart) or your content (eg VERIFY for OTP).
ID cannot be a person name or related to government authorities/firms, banks, stock market etc. For eg (SBIONL, IRCTC, LICIND). If you still wish to use one, you or your client need to provide us with a letterhead signed by the organization stating that you are allowed to use their Sender IDs.
For stock market messages, your user must be registered with SEBI and should be able to provide a SEBI certificate.

MARKETING:-

Any kind of promotion, marketing, sales, offers, invitations can only be sent through transactional route or to DND numbers only if the recipients are your registered users.

CONTENT:-

The message should share proper information and not contain any spam content or keywords belonging to the category. For eg. greetings, personal messages, etc.