We have to send many messages to many of the friends, But the cost goes to very high . So , remove thee costs we use SMS gateway site like Way2sms, Ultoo, 160BY2, or many other websites. But, to send messages We have to be a registered members.
But now, we can bypass it, There are two websites which provide Free sms or Free call facility without registration.
Just, go to the website given below and type the number of the person to whom you want to send message and type your sms and then click on send. its too easy
Websites are :