Airtel 2 good, this to cane airtel mobile. Dail *444#,den *203*1# it may tel u that u re not allow 2 migrate to diamond step up simply dail 111 for custmer care and tell them that you want to migrate to diamond step up they will migrate you within 24hrs, after the migration dail *300*1# they will give you 500mgb and 100sms.you can dail it continously til you tired. To check your you validity bundle dail *141*712*0# to check for your sms dail *123*5#. Test it and reply