In all three Three NEW Voice STVs or Boosters has been introduced under denominations like 290,990 & 699 with w.e.f. 25/07/2011. The STVs promises a better call tariff and comes along with long validity. So you don’t have to worry about and have a headache of recharging often. The details of which has been summarized below These STVs/Boosters are made available to all 2G/3G prepaid customers under Group I in Multiple Boosters through C-TOP-UP. 1.   i) To Mobile BSNL N/w @ Rs.0.10/min, ii) To Landline/WLL BSNL N/W @ Rs.0.49/min, iii) To other N/W (LL/WLL/Mobile) @ Rs.0.49/min   2.   i) To Mobile BSNL N/w @ Rs.0.10/min, ii) To Landline/WLL BSNL N/W @ Rs.0.49/min, iii) To other N/W (LL/WLL/Mobile) @ Rs.0.49/min   3.   4.   Since the 3G facilities like video Calls are given by default to all the 2G prepaid mobile customers, the STV/Booster of MRP 57 is extended to 2G prepaid mobile customers also through C-TOPUP.

BSNL Launches Voice STVs for Tamil Nadu   TelecomTalk - 39