How do I locate my stolen iPhone 15 Pro Max?

Apple doesn't get involved in lost or stolen devices and this is a user to user only forum, so we can't help you locate your stolen iPhone. Assuming you had Find My enabled before the phone was stolen, it is powered and connected to a network, the following links will offer what you can do to try to find your stolen device. But the reality is most stolen phones are never recovered. Thieves usually place them in a Faraday Bag, which makes them impossible to track. And be advised Apple will NEVER send you an email saying your phone has been found. If you get one, it's from the Thieves who are trying to trick you into handing over your Apple credentials so they can get in your phone. Don't fall for this.

See the following:

Find your lost iPhone or iPad - Apple Support

If your iPhone or iPad was stolen - Apple Support

If you do see a location, it would be a very bad idea to go there to confront the criminals in person. You might lose a lot more than just a phone.