Airport WiFi

• San Francisco : free
  
• Hong Kong: free
• Beijing domestic waiting lounge: 300RMB for cup of tea, then network is free, found unsecured office WiFi, I'll use it, of course
• Beijing international waiting lounge: operated by China Mobile. Only accepts payments via SMS on China Mobile cell phone. In fact not even all China Mobile cell phone numbers are accepted, only the most expensive packages allow user to pay for WiFi, otherwise even money cannot buy access. Fees are charged by the minutes.
• Shanghai domestic waiting lounge: operated by China Netcom (CNC). No online payment system, no cell phone payment system. User has to purchase prepaid card. There is NO card sale in the airport.