Airtel Mobile Number Balance Transfer Code:
A popup menu will show on your mobile phone
In that Choose the option 1st >> Share Talk Time >> Type 1 on your phone keypad and press Send.
Then in Type balance amount and mobile number.
Terms & Conditions:
Note that you have a minimum 10rs. Balance to share talktime to other numbers. so that you can share talktime upto five times a day and 30 times / month.