This is the most common problem on Airtel sim today that the speed of the internet is not as good as in some areas.(Probably That's why title attracted to you).
As you know , airtel recently launched its VOLTE service. Its called Voice over LTE . This technology uses internet to make call.
So trick is simple that you've to make call while using internet. This will make your internet speed fast as long as you're on call.
I know Its not permanent solution to make internet fast but it may work for sometime.
So use this trick whenever in problem.
