Solution Steps

1. Open Settings app on your iPhone.
2. Tap "General" → Scroll down to "Transfer or Reset iPhone".
3. Tap "Reset" → Select "Reset Network Settings".
4. Enter your passcode if prompted.
5. Tap "Reset Network Settings" to confirm.
6. Your iPhone will restart and network settings will be reset.
7. You'll need to reconnect to Wi-Fi networks and re-pair Bluetooth devices.