WIFI CONNECT PROBLEM
EVERY TIME I TRIED TO CONNECT TO WIFI NETWORK BUT NOT SUCCEEDED.
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Here is what Apple recommends checking ➡️ If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
Check your shift key setting when entering the Wi-Fi password too, as entering the wrong case for a lowercase or mixed-case Wi-Fi password will get that password rejected.
If you’ve gone through the complete list of troubleshooting steps, contact Apple for a discussion about this iPhone, and potentially about repairs that might be here. Use the Get Support link in the upper right of this webpage, and open a hardware support request