I flew in via Shanghai Pudong, there was a counter selling sim cards. prior to immigration. I think I showed my passport. Entire process was easy.Do you mind if I ask where you bought the local sim from, was there a booth at the airport when you landed? Did you have to give them any ID to purchase it? I'm going in a few months and I'm wondering how easy it is to buy a local sim since I want a local phone number while I'm there.