My phone won’t connect to Wi-Fi or Bluetooth

Go to Settings>General>Transfer or Reset [Device]> Reset>Reset Network Settings, bearing n mind that this procedure also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before, but NO other data is affected.

When done, restart your iPhone, then test it.

Regards

Giulio

WiFi issues: If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support

Bluetooth issues: If you can't connect a Bluetooth accessory to your iPhone, iPad, or iPod touch - Apple Support