GET UNLIMITED GB ON YOUR AIRTEL SIM (new !)

METHOD 1
load 1000naira card ( make sure your balance is not more than the 1000 in your phone book, save *141*11*4*phone number# as 1 or aa ( i.e let it be the first thing that will be in your phone book contact ) (the phone number after * above should be your airtel number or your friend airtel phone number that you want to transfer data to dial another number and once it start ringing , scroll down to where you save that 1 or aa and then dial it you can dial 1 or aa 5times per call but make sure you dont dial the 1 or aa when the call have ended so that airtel will not deduct that your 1000 ,
 
NOTE : each time you dial it , you will be giving 200mb and you can continue to do it till it get to 19gb 
METHOD 2 
for those who dont have 1000naira for step 1 load 100naira card ( make sure your balance is not more than the 100 in your phone book , save *141*712*11*phone number# as 1 ( let it be the first thing that will be in your phonebook contact ) (the phone number after * above should be your airtel number or your friend airtel phone number dial another number and once it start ringing , scroll down to where you save that 1 and then dial it you can dial 1t 5times per call but make sure you dont dial the 1 when the call have ended so that airtel will not deduct that your 100 
NOTE : each time you dial it , you will be giving 10mb and you can continue to do it till it get to 19GB