Tata Docomo nowadays seems to silently brush up its special tariff vouchers.Recently they went for a change in its Rs. 24 special tariff voucher in the state of Tamil Nadu.
So long the Rs.24 STV had an initial validity of 30 days which has been now reduced to just 20 days.
Same thing followed the Rs.66 STV which had an initial validity of 90 days, now being offered at just 60 days.
This came in effect from 6th August 2011 onwards. The tariff of both the STVs offer the same benefit of calling all India at just Rs. 0.005/sec.
Thanks to S.Sudhakar