jio sim directly launch 4g services with pan india using a Lte Technology, jio is knowns as officially reliance Jio & officially reliance Jio infocomm limited, jio provides cellular services with 4G network and unlimited calling and very nice data plans. Jio all prepaid plans have free unlimited calling. JIO customer can call on following number for customer support and ask any kind of queries for jio services. 

Jio Toll Free Number :               1800-88-99999   (From any other operator)

Jio Customer Care number:     199                       (From Jio Number)

Tele verification:                         1977                     (For HD calling)

Jio Customer Care Mail Id:         [email protected]

Reliance Jio Plans for Prepaid customers