1, click the settings of iphone.
2. Select the "General" option in the settings home page.
3. After entering "General", there is a "Restore" option at the bottom, click.
4. Then there will be items that can be restored. Select "Restore Network Settings" in it.
5. Then you need to enter your original mobile phone password to complete it.
6. After entering the password, a red prompt will appear. After the selection, the phone will be restarted, and all the network settings in it will be reset, so that you can reconnect the wifi that you couldn't connect at first.