In this post, i will be sharing a simple trick on free call to all networks. Meaning that even when you have 0.0kb

on your Airtel sim you can still flash any number.
HOW TO FLASH ANY NUMBER ON AIRTEL WITH 0.0kb
Firstly, Get your phone with your Airtel sim inserted.
Now go to your dialer, type ** and the phone number you want to call. Example: **09059125339.
Once you type that, dial the number. Your phone will tell you unable to connect and it will cut the call. While the number you were trying to call has been flashed already in your receivers end.
This is preety simple. This trick is helpful when you run out of call credits.

Source: facelika..com/

Lwkm! It worked oo... Nice one OP