I would like to trade in my iPhone 11 Pro for a new iPhone 12 Pro Max

See here: Buy iPhone 12 Pro and iPhone 12 Pro Max - Apple

The iPhone 12 Pro Max will be available for Pre-Order on November 6th. You can go through the trade-in process at that time during the purchase.

You can go through the configuration process now, and enter your current iPhone's details to get an estimate of the value for it.

Go into the link provided, and run through the configuration process of the iPhone 12. One of the steps is to enter your old phone’s details to get a value estimate for it.

Enter your phone’s details there to get the value:

lorna264 wrote:

Hi Phil when does the iPhone 12 pro max come out

As I said above, Pre-Orders will be available on November 6th.

When it will actually be available in stores, is unknown since Apple has not said.

See here for trade in information: https://www.apple.com/shop/trade-in