Probably nobody knows the answer but going to try anyways. I am going to give back my 11 Pro max to upgrade my line since I still owe $570 bucks on it.. I would like to buy an iPhone 8 for $280. Can I give back my 11 pro to upgrade but also say I have an 8 to trade in and get the $800 credits. I upgrade every year so I would only get a years worth of credits but after doing the math it will still save me $200 off the price of a 12 pro max. (Minus the $280 for 8 and 1 years worth of credits $480) So question is can I give back my 11 pro max to upgrade while trading in a 8 to get the credits. So basically 2 trade ins in one transaction?