Hi,There are are lots of sites and software available in the market which allow you to send sms.
messengers are among them they allow users to send sms to mobile nos Rediffbol allow users to send 3 sms per day for sending more sms the receiver has to reply.This is one of the main problem associated with the messenger smsing.In some
providers allow user to send sms via email.The format for sms email is like mobileno@bplmobile.com.But most of the providers blocked this service.you can easily find the operator address from Google Recently i had i found a website which allow people to send
unlimited no of sms@free of cost. They appended some advt at the end of our sms I had checked this service its very good.The sms delivery is very fast.... The website address is www.way2sms.com