Jio sim is very useful to us. It give us free calling free data. Its network is good. Jio is inspire, empower and enable every Indian to live their many dreams.Jio network is the first of its kind to provide 4G experience across in India. HD voice call and high speed internet. jio is roaming free. It provide us digital life. Its head quater is Navi Mumbai in Maharastra. Relience Jio ower is Mukesh Ambani. The company has a network more than 250000 km fiber optic cambles in the country.