Now you can enjoy all offer of Robi and Airtel in one robi or airtel sim, because both of those sim are under a network..
now you are get free 18 GB internet by buying a new Airtel or Robi Sim and get one free.
see details in below:
If you buy one Robi prepaid sim then you get one sim airtel sim free. enjoy 18 gb internet in airtel sim.
you can also enjoy 1 gb internet in 30 taka and many exciting offer wait for you.