1、Tools->Options->connections ,set Fiddler listens on port 8888 (local IP 192.168.0.114) 2、Set up the proxy in the wireless network of the mobile phone : IP :192.168.0.114 and port: 8888 3、Mobile phones can not access the Internet the fidder version is v4.6.20172.31233 , .Net Framework version is 4.7