Now send Airtel Unlimited Free SMS Send to all Network.
Just Follow the Instruction:

>Go to Write msg Options
>NY Friend Number Your MSG
>Send it to 55444

Note: keep balance Rs.0

Example: NY 9876543210 Hello AirtelTrickianz , How Are You ?
Send it to 55444.

This Trick Shared by our user Goutam. Thanks to him.