Jio is amazing 4g network and supported in 4g smartphone and volte phone supported and Jio speed is good and also Jio sim work for non volte phone But one condition is download the Jio 4g voice and register and his work but sometimes is not good preform for Jio sim is 4g downloading and surfing speed is very low and Jio call is not work for sometimes all the network call drop from Jio customer and Jio network problem is low But Jio sim is amazing and free offer for unlimited 4g and voice calls and messages .Jio welcome offer valid is 31 December 2016