Reliance Jio, Airtel, Vi, and BSNL have been mandated to offer SMS and voice only STVs.TRAI has ordered telecom operators to provide STVs for voice and SMS services.TRAI has removed the cap on STV and combo voucher validity, setting it at 365 days.Telcos no longer need to offer color-coded vouchers or talktime vouchers in multiples of Rs 10.