Telecom Regulatory Authority Of India - Subsection
Section 20(2)(k) in The Telecom Commercial Communications Customer Preference Regulations, 2010
(k)no Access Provider shall provide to any person, other than a telemarketer registered as per regulation 14, any tariff plan or SMS package in any form such as special recharge voucher, student pack, seasonal pack, etc., permitting sending of more than one hundred SMS per day per SIM except on 'blackout days' and additional days as may be specified by the Authority by direction issued from time-to-time and all such SMS packages already provided to any such person shall not be renewed after their expiry: