I had bought a clay sim for Hong Kong after hearing so much about their network services and connectivity. But I had such a terrible experience using their sim card. Most of the time I didn’t have any signals on my phone. And when I called their customer care team to help me out with this constant call drops, they just said they cant do much about it and just hung up on me. Throughout those 6 days in Hong Kong, I was facing this issue and most of the times used pay phones or calling cards. I would rather not use any service than use clay sims again ever.