1. After the mobile phone wifi has been connected but there is an exclamation mark problem, we first detect whether it is an unexpected problem of the mobile phone itself, and we can shut down and restart the connection to see if such a situation will occur again. Or use other phones or devices to connect to WiFi to try to get online and eliminate the problem of WiFi itself.
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2, if it is not the problem of the mobile phone, the mobile phone wifi has been connected but there is an exclamation point problem, we can also restart the router to see, or restore the router to the factory Settings, and then re-dial the Internet, and according to the setting wizard to reset the WiFi, or replace the new router and dial up the Internet.
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3, see whether the router has a red light, or directly contact the broadband customer service, generally there will be a number on the router, and then confirm whether the broadband account is abnormal, such as arrearage, recharge the broadband, and then try the dial-up connection.
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4. If the name of our wireless WiFi is in Chinese, we can try to change the name and test again. It is suggested to change it to English or a combination of English and numbers before connecting.
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5, if the above methods can not be solved, it should be the problem of the phone itself, we can restore the factory Settings and try again, if not to go to the nearby after-sales check is also ok.