Fix 'Unable to Join Network Failure (error -3)' error on iPhone

The "Unable to Join Network Failure (error -3)" error message appears on the iPhone when the Wi-Fi network is not connected. In fact, the reasons for this are the same as for computers that are not connected to a home network or wireless hotspot. To resolve these issues, do the following:

• Check the SSID name settings on the iPhone to make sure it matches the Wi-Fi hotspot. SSID is quite sensitive case.
• Check the security configuration (WEP or WPA parameters) on iPhone to make sure the values ​​(encryption key or password) match the access point. The encryption keys are not case sensitive, but the password is.
• If both steps do not fix the problem, fix the security settings on the Wi-Fi hotspot. Contact the access point administrator for further assistance if needed.

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