Website For Free SMS in India
I came across this site called www.mobik.com which provides free sms for india and other countries too. This sms is delivered immediately (checked for airtel gujarat and relience gujarat). Minus points are 120 character limit and showing video ads before sending the message.
You can use indiatimes chikka messenger to send sms but it only provides 10 SMS per day so you can open as many account as you need and send messages to your friend :-).