How to connect to mobile internet in Shanghai?

Do you want your phone and laptop connect to the mobile Internet？I suggest you buy a phone SIM card that contains mobile data plans so that your phone can be connected to the Internet. And you just need to turn on the phone's personal hotspot and then connect your laptop to your phone's personal hotspot to access the internet. Besides, in the most public places of Shanghai, like restaurants shopping malls and hotels, offer free Wi-Fi for people.