All you just have to do is get that amount and follow the procedures in getting it.. I can't say it works on all sims but it may work on yours ..No harm in trying?
HOW TO GET NEW AIRTEL N1200 FOR BROWSING AND CALLING
With that amount been talked about above just Simply Dial *235*200# And Instantly you will be credited with 1200 naira Bagam!..
You can see the screenshot of the one a friend got after doing his..