I bought this sim last month and I must say the speed of network on 4g is really great in small cities also. To bought this sim you have to generate a code on your mobile phone by installing my jio app in the mobiles described in jio preview offer. In this offer you will get 3 months unlimited data, calling and sms. I also used this sim on roaming and surprisingly I am able to use data and even a calling facility on roaming also. I love the signal strength and the speed of internet available in small cities. Also you have to install all the applications shown on my jio app to generate a code. It works on all 4g mobile phones and the signal strength in maximum areas is good. In my opinion must go for it.