Jio sim is nice because it is free for all 4G users. It provide free calls, internet, sms unlimited all over India. The Jio releshed on Augest and its validity upto free service 31st december, 2015. But recently the C/O announced that it will free upto 31st march, 2016.But every good things bring a problem that is Jio only supported in the 4G mobiles because its network coverage is only 4G. But recently we heard that Jio is working on 3G network. Its network coverage is nice in the town site and high speed internet. And in the village site it is not very godd, but good and speed is not super speed. So if you have 4G mobile then please join Jio.