The first reason: the password is incorrect, please carefully check whether the entered password is correct.
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The second reason: it is not your mobile phone device, it should be your mobile phone device's wireless network card is limited connection, resulting in the correct password can not be connected normally.
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Unless the other party lifts the restriction, your mobile device cannot connect to the wifi network signal normally.
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[The solution to the incorrect password displayed when the iPhone is connected to WiFi]
wifi password input error Please check the case