Telecom level (mobile, telecom, Unicom), those will have the corresponding SSID logo. Whether to charge depends mainly on whether there is free traffic in your current Internet package, what to register, and there will be instructions on the opened webpage;

Charge (similar to many wireless network cable operators in Hong Kong). First of all, the SSID is not encrypted. After accessing, opening the browser will prompt you to register or something, but you can usually surf the Internet for half an hour or 1 hour for free. . .

Everything is free (in some restaurants or kalaok, etc.). ), the SSID will be encrypted. You can ask the waiter for the FIWI password ... you know.

Free (the government will provide a limited network for users to access in some designated public places), and it is usually not encrypted.

I almost missed it. Back to your question, it depends on which type it belongs to.