I live in Pallavaram which is near to the Chennai airport. I contacted 121 after seeing the ads in my place. Your monthly rental stays the same with upgraded speed of 40mbps but within chennai limit they are also offering 100mbps plans. The only con is the FUP. 121 told that they will be providing a new WIFI modem for Rs.1000 (Rs.200 for 5 months) as this is a fiber network. I will add few images and speed test once the installation is done. I still doubt its a fiber network. I read somewhere that adsl 2 will work upto 100mbps.
Post 1 updated with another plan