- DiDi is the Uber of China. Wonderful UX, English language UI with automatic two-way translation of messages and support for western credit cards.
- AliPay & WeChat wallet are the primary methods of payment in China. You can enable a WeChat Wallet using a western credit card, but in most cases that card cannot be used for payments. You can have easily exchange cash for WeChat RMB, as other users can transfer RMB to your account free of charge. AliPay requires a local phone number & bank account (and no, the one you use for AliExpress does not work for mobile payments.)
- The subway system in Shenzhen, Shanghai & Beijing is really well maintained. You can use cash or Alipay/Wechat to pay.
- All foreign cell contracts pipe traffic through their local servers, so they automatically VPN through the Great Firewall.
- ProjectFI recently lost 99% of LTE coverage in China. T-Mobile cancelled their contract with China Unicom, and Nexus phones do not support the LTE bandwith China Mobile uses. You're stuck on the EDGE network 99% of the time.
- China Construction Bank opens up accounts for foreigners without Visa.
- One thing that was not mentioned in Karim's post: advanced manufacturing facilities. Try booking a tour: they can significantly alter what you think is possible.