Getting calls from 1600 or 140 series? Know the difference between the two and whether you can block them

https://www.livemint.com/news/india/getting-calls-from-1600-or-140-series-know-the-difference-between-the-two-and-whether-you-can-block-them-11783826714367.html
The 1600-series numbers are used for service and transaction calls by financial entities, while 140-series numbers are meant for promotional calls. Calls from the 1600 series cannot be tagged, filtered, or blocked, whereas 140 calls can be blocked based on a user’s DND preferences…