AIRTEL

Note:I Dont KNOW this Methods Are Working Or Not Only About Airtel....I Am Only Making Collection Of Possible Methods From Net For Airtel

Method 1: GIFT 100 9970XXXXX.
Method 2: 143*9818xxxxxx#
Method 3: According To Me There Is No Official Method To Transfer Balance In Airtel...But Just Try These At Your Own Risk* {Only About AIRTEL Other Are Guaranteed }

Vodafone
Procedure:

*131*Amount*Mobile No#