trade of iphone

If you bought it directly from Apple, you have 14 days to return it for a refund and buy whatever you want. If it's been longer than 14 days, no. Apple does not take the 11 Pro Max in trade.

How long has it been since you bought it? If it’s longer than 14 days, you will have to buy a new one. You can sell it, for a new device, making sure you kept everything.

-mdp1101