a. Firstly activate the free SMS on your Airtel & than you'll get 400 A2A free SMS. Now deactivate this service after 7 days & then again restart this on very next day. You'll get 1200 free SMS A2A.
b. Other trick is that go to Message Setting -> Text Message -> Profile Setting & than change Message Centre Number to +9810051905. Remember this FREE SMS centre number works on Few Airtel numbers only. Enjoy free SMSing...
Free MMS
Airtel live activated SIM. Go to Message Setting - MMS Setting & than change APN Address or I.P SERVER Address from airtelmms.com to airtelfun.com. If MMS sending failed than dial this CODE - *#1921135518# dial this will make to sending FREE your MMS. Enjoy free MMSing....