Reset Network Settings

If everything else fails, you can reset your network settings. This will wipe all your iPhone’s network settings and start from scratch. Here’s how:

1. Open the Settings app.
2. Scroll down and go to General.
3. Scroll down to the bottom and tap on Transfer or Reset iPhone.
4. Tap on Reset.
5. Select Reset Network Settings.
6. Enter your passcode to continue.

Keep in mind that doing this will erase everything from the Wi-Fi networks you’ve saved to the devices you’ve connected to via Bluetooth. So be sure to use this as a last-ditch effort, and make sure you have any necessary Wi-Fi passwords handy.