From Vi customer care -yep they've launched a new 128 plan with SMS benefits.
check in others section
to send message you need to recharge with Rs.128 or above unlimited pack, benefit of Rs.128 recharge pack is given below.
• All local national call charges 2.5P/second
• 10 On-net night minutes Vi to Vi (11PM to 6AM)
• SMS charges as per base tariff
• Activation mode ETOP UP, Vi App, Website
• Activation time 30 minutes
• Product validity 28 days
• Service validity 28 days