In a single post below you get airtel,idea and reliance sms center number.using these sms center number you can send unlimited local sms around your state for free,no matter what plan you are using.the following is the number for free sms
FREE
SmS CenteR
AirteL
+919892051914
+919855500022
ReliancE
+919020000060
!deA
+919891030080
+919844298443