As per TRAI Guidelines BSNL Karnataka Circle has revised the tariff for SMS as given below for GSM /CDMA/WLL (MSC Based)

Revision in SMS tariff by TRAI in its Telecom Tariff
( 54th Amendment) order.

a)Upto one hundred SMS per SIM per day ,the SMS charges will be as per the plan /STV subscribed by the customer; and
b)Beyond 100 SMS per SIM per day, the SMS charges will be as per the plan or 50 paise per SMS whichever is more.
c) For customers who have subscribed to any volume based SMS STVs( pre-paid) /SMS Pack (post paid) upto 100 SMS per SIM per day will be free/discounted and beyond that the SMS charges will be as per the plan or 50 paise per SMS whichever is more.
The above revision is applicable to all post paid and pre-paid customers under GSM /CDMA/WLL (MSC Based) services and is implemented with immediate effect.