my new iPhone 15 Pro Max won't discover any of my bluetooth devices

Zachyy wrote:

If you can't connect a Bluetooth accessory to your iPhone, make sure your Bluetooth device is near your iPhone, and is on and has a charge.

Learn how to ⇢ If you can't connect a Bluetooth accessory to your iPhone or iPad - Apple Support

-Zachyy ✌️

https://discussions.apple.com/content/attachment/6cf032eb-a326-48d6-9338-910b3f311540

Being on and close by isn't enough. It has to be in pairing mode to be able to connect.

If you can't connect a Bluetooth accessory to your iPhone, make sure your Bluetooth device is near your iPhone, and is on and has a charge.

Learn how to ⇢ If you can't connect a Bluetooth accessory to your iPhone or iPad - Apple Support

-Zachyy ✌️

Pairing mode, of course.

Are the devices in discoverable (pairing) mode?

What are the "devices" you're trying to pair with?