When I had 3 hours to spare at the Hyderabad Airport, the first thing I checked was a decent wifi zone. Tata Communication has placed their counter prominently and a technician attends to you advising that the free connection lasts for just 45 minutes and if I need serious good quality internet connection I should purchase a internet prepaid card form tata website, which I promptly did . I purchased a 3 hour package at Rs. 300/-. And then all hell broke lose. It would have been better for my mental health had I stayed on reading a newspaper than trying to configure the Tata wifi.
To cut the story short, after an hour of struggle with the paid account, I went back to the free account that was slightly better than the paid account - in the sense that it could load a site after 2-3 attempts . However both connections were plagued with intermittent disconnection, perennial waits to connect, and even basic gmail site was giving connection errors due to improper loading. Forget about you tube or any pictures loading - which was my main aim of paying up for the connection.
So please take my suggestion, unless these VSNL guys have done something drastic, stay away from a tata wifi zone in Hyderabad.
Sanjay