One of the main diference jio from others is it supports video call even if the mobile data is off.
I lives in a village kerala. Always it has good internet speed. Other network sometimes goes 2g speed. Jio, as it has only 4g network, if there is a range for jio there will be 4g speed. Another thing is, we have to download Jio4gvoice app then only we can use jio service in a non Volte Smartphone.
So to use jio service we need a 4g smartphone.
Better it is a 4g Volte smartphone.
Also jio keypad phone is there for Rs 1500.