Airtel is oldest or best network in India. Every single person know about its signal strength and network coverage. Service of airtel is also good and the customer support is best. 70% of peoplein India use Airtel cause of the trust on company whether people use Jio due to its Welcome offer but people talk airtel as the Primary Sim Preference in terms of network and service. Airtel have only one drawback that is its charges that is bit high than the other networks. Or other way Airtel is the best.