Let’s just go straight to the point: Below is the trick to enable you to get up to 8GB of free data on your Airtel sim.
Any Airtel Sim.
With or Without Credit on the Sim
Firstly, Send JOIN to 141 as a text message
After sending the JOIN to 141, just dial this code *123*133#
Wait for the reply, You are going to get up to 8GB, 2GB, 1GB, 500MB. It all depends on your Airtel Sim eligibility to acquire the highest Data.
To check your Data balance: Still dial *123*133#
I actually saw this Airtel trick online few minutes before composing this article.
I gave it a trial and the result was awesome. It did work for me and I got Free 2GB of data on my first Airtel Sim and 8GB of data plan on my other Airtel Sim.