I am using Airtel 4g sim. But my handset is 3g . Signal is good working. But poor signal inside of my room. I always search and download with Airtel sim in3g. Airtel offers 5gb night pack in "My Airtel" app. I have used around 2.5 GB among them. Airtel also offers 1 GB 4g data by making miss call on 55555. But I am using 3g Android. I like Airtel.