Usually, other companies block promotional messages by calling helpline or by visiting service centers.
How to Block Promotional Messages:
To block promotional SMS,
- Visit this URL: http://188.8.131.52/websms/blocklist.aspx
- Enter your number and you will receive a PIN Code
- Enter that PIN code on the website to block all promotional SMS.
To unblock promotional SMS just enter your number and unblock the promotional SMS.