When I use this network in starting I thought that when my phone signal drop down to only one 1 signal so than my call connect or not or the voice quality was effected with that or not but thanks to jio volte feature they gives u best call quality even a signal network bar in my phone.
many time I call to the customer service to know about the new plans and the current plans of my jio sim they provide me full details thank to is good customer support.
I used this sim almost 1 years and I spend it total 99+303+today399. total 801 for this one year and they give me free internet, calls, callertone, videocalls, many more so I think it very cheap. I love this jio network.