Im using Vodafone since 2014 and Im happy with that. Last August initially JIO has launched their services as preview services. So we cant review on JIO. But from March 2017 it is a paid services and we can compare or make a review on this company very easily.
Yes, you guess it correct, this Reliance Jio can only available directly only on the almost all 4G comparable handsets. Currently Im in Konnagar, here Reliance JIO has work beautifully through out the city as well as remote areas. Even though I had few times in north east their network reception of jio was nice.
I have no speed related issues in my current location, but before this paid service has started the speed was even better(between Auguest 2016- November 2016).
Now come to the price to package ration. In other service providers they are overtiring very expensive packs but jio is offering beyond those packs with less amount of money. Other companies are yelling on Jios offers literally.
The most advantges are
- NO roaming 
- value for money 
- True Unlimted packs 
- VoLTE 
- No caller tune charge 
- No Value added service charge 
But Jio also has its down-point
- Not everywhere you find network. 
- Only available for 4G devices. 
- Paper recharge is not available 
- VoLTE has a issue over some areas. 
Overall this JIO services is nice.