How does the Web page know that the user is currently accessing the phone or through the 3G/4G network?

Vaguely remember the past seems to have seen what the header information can be judged, to use the found.
It should be as long as the mobile network access, operators will be in the header to add some information. Can someone give it to you?

Reply content:

Vaguely remember the past seems to have seen what the header information can be judged, to use the found.
It should be as long as the mobile network access, operators will be in the header to add some information. Can someone give it to you?

This is the reason for the browser,

Android UserAgent, there's a nettype/wifi inside

Mozilla/5.0 (Linux; U; Android 4.4.4; zh-cn; m1 note Build/KTU84P) AppleWebKit/533.1 (KHTML, like Gecko)Version/4.0 MQQBrowser/5.4 TBS/025489 Mobile Safari/533.1 MicroMessenger/6.3.13.49_r4080b63.740 NetType/WIFI Language/zh_CN

Iosuseragent same Nettype/wifi

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