Recharge you Airtel with N400
After a successful card recharging dial this *440*2#. Then you will be promoted by them sending you a message that you have gotten
browsing till the given MB is exhausted.
Just download quick but in the case that the Mb can not be used to browse on your phone the will require you to obtain 10mb and join it with the already given 600mb and boom it will commence working. To get the 10mb with just N100 dial*141*712*11#. Happy browsing.