Rs.6 flexy = 1500 nat/loc sms(3days validity)
Rs.15 flexy = 3000 nat/loc sms(7days validity)
Rs.44 flexy = 4400 nat/loc sms(30days validity)
Its Not A Trick, But it is very useful. Just Recharge with Rs. 6 you will get 1500 sms with the validity of 3 days. Then at the end of validity ending day recharge with Rs. 10 [you will get normal talktime] and Now you can send the balance SMS for another 7 days. Means you will get 7 day validity for your balance sms. Tested 100% in kerala and karnataka. enjoy
You can use this trick when you are using any of RS.6, RS.15, RS.44 Now try onwards !!!