So the Telecom Regulatory Authority of India is looking after customers after all. One of the biggest problems faced by mobile users in India right now is the number of calls they get from direct marketers on behalf of banks and other financial instruments. These could be in the nature of loan requests, credit card requests, insurance, and others. Most customers find these calls extemely irritating and keep on getting frustated because they do not see a solution. In addition, they really suffer if they are roaming nationally or internationally and have to suffer roaming charges for these junk calls.
In proposed guidelines, the TRAI proposes to ban banks from using the services of direct sales agents for selling their financial products. Refer this article:

Unsolicited telemarketing calls may soon become history. Under new guidelines on unsolicited commercial calls, telecom regulatory authority of India (TRAI) proposes to forbid banks from using the services of direct sales agents for marketing financial tools. Banking industry accounts for about 90 per cent of the unsolicited calls, according to TRAI estimates. There are about 30,000 direct sales agents appointed by banks and they are not covered by any rules and regulations as they do not have a licence from any government authority.
The new guidelines that regulators would propose this week would make it mandatory for all the banks to use the services of other service providers (OSPs), who are licensed entities and work under the guidelines formulated by the department of telecommunications (DoT).

This is really welcome news for customers. In addition, TRAI envisages maintaining a national Do not Call Registry, and subscribers can register themselves with this DNC registry. All banks and their agents would have to respect the names of people in this registry, and banks would be charged penalties if they violate these rules. This would make India equal to other countries in terms of customer protection, and should bring a sense of relief to customers. In addition, TRAI wants mobile operators to disconnect those subscribers who make unsolicited calls.