Never go for a MTNL wifi. They promise a particular speed i.e 2mbps and its very slow. On the other hand first two months it wil be very smooth and continuous and after that ir gives you major problems like stops for days and stops at one rain. The service people who come to repair also dont know the reason for the problem at times. I had to call the service people atleast 4-5 times in a month and it was really bad that I had to change to a better wifi connection and yes at a better cost and scheme.