Hey friends, i dnt know if you re aware of this great offer from Airtel, 600%  of every recharge from  100 Naira and Above 
not long ago i posted Glo free Airtime with 400% Bonus on Recharge of 100 Naira  

Now i believe Airtel is here for competition.

 Here is the message i got from Airtel.
600% Bonus only for you! get 600%  extra airtime on every  recharge! Top up N100 credit  and Dial *235*100# to instantly get N600 (voice + Data; Bonus valid 2days )

you can also top up N200 credit and Dial *235*200# to instantly get N1200