Telecom Regulatory Authority of India (TRAI) introduced these codes in order to curb bulk SMS providers from unsolicited commercial communication. Now that these codes are implemented, the sender can be traced, if necessary, as these codes reveal the location, the name of the company and the service provider.
This is how the code should look like:
XY-name of the company
X = Code of the service provider
Y = Location
Which means, IZ-ICICIBANK would be:
I = Idea Cellular (service provider)
Z = Maharashtra (location)
A list of Service Provider codes & Service Area codes:
So, I am sure next time you get an SMS with a code like this, you’ll know what it is.
(Image Credits: thatsoftwareguy)