I first hesitated to get one jio sim regarding the issue that it will block my sim 1 slot, but later it changed my way of thinking.It is just super awesome.Its speeds is wonderful.I recently went on a trip to the mountains and there were network every were.But there are cons too.Calls dont connect easily, it says that the line is busy.And if you remove it from your sim 1 slot yours offer get cancelled.But its worth a try.