Affordable and convenient-- I am traveling for work and currently in Shanghai. Before traveling I was handed over a matrix sim for Hong Kong with all details of calling and data usage. It was very convenient for me especially when I landed and had to coordinate with my colleagues for a pickup. They already had my number and connecting with them became real easy. I have been here for over a month now and my monthly usage hasn't exceeded more than 7000 rs. Matrix sims have definitely solved my purpose of convenience and affordability. Good!