Dinkar - 8:57 am on Dec 3, 2010 (gmt 0)
Actually, there should NOT be 'Do Not Track', 'Do Not Call' options (registry/database). It should be 'Track Me' and 'Call Me' option. Such database can be created either by each company that is willing to track / call their customers etc or by some agency.
Current 'Do Not Call' option is useless. There are thousands of companies that has created their own 'Do Not Call' databases. It's not possible to register with all those thousands of databases to stop junk calls and SMS.
Yes, there is national level 'Do Not Call' database but it is also useless. Because even if you registered with it, still you will get junk calls and SMS :(