rachdoshi has posted a comment about the promotional offer. I wonder how I missed clicking through the link. I missed it because it didn't look like a hyperlink to me. Here it is.
The first three SMSs are charged. After that you get 750 local SMSs free per day. ( I have a doubt here. Do we have to send three paid SMS every day to get the free offer or is it that we just send three SMSs and get 750 free SMSs lifetime?)
STD calls at one paise per second is also a promotional offer.