Airtel provides only 400 msgs on 5rs SMS pack that too with a validity of only 1 day.
But u can get 410 msgs by simply followings the simple steps that too with a validity of 30 days.
so heres the step:-
1)Buy a 10rs recharge, on it u will be getting Rs 6 talktime and plus 10 msgs with a validity of 30 days 2)check ur sms balance by dialing *123*3# it will be showing 10 msgs with a validity of 30 days 3)Dial *222#[use *555# if *222# not working] goto daily packs for 5rs sms in which u will be getting 400 sms for only 1 day but not to worry these 400 msgs will be added with ur 10 msgs which u were given on 10rs recharge.
4)After subscribing with 5rs sms pack u will get a msg from Airtel that ur msg pack has been activated
5)Now dial *123*3# ur message balance will be 410 msgs with a validity of 30 days.