Airtel 4G sim has fastest internet speed. In prevoius years they launched airtel 4G internet services and their prices was very high. But after launching reliance jio sim their demand contracts. But after jult month 2017 their prices are higher than Idea, reliance jio sims . Their mobile towers are low conncections. In village areas their network tower signals didn, t reach in small cities. Their conncection reliability is poor.