Talk:China/@comment-203.116.184.130-20151020060610/@comment-3564598-20151026182606

The airport does have a shop to buy SIMs, but I don't think they sell China Mobile. Personal recommendation is to find a China Mobile service center to buy a SIM on the 4G plan (which is nationwide). For extra data, if you plan on using your phone at night, buy the night-time data package, or buy the regular extra data add-on if needed.

Where in Shanghai would you be? Service centers are everywhere but which one works best for you would vary depending on where you are; sometimes the closest one isn't the best one for customer service or crowdedness reasons.