Is it better to pay an iPhone in full or finance it?

I'm buying an iPhone 7 plus soon but it will total out to over $800 after taxes. I have the money but i'm also trying to save up for school so I'm not sure if financing through Apple would be a good alternative?

Added:
Something else to consider… If you have a functional smartphone, you may want to wait for the new iPhone to come out. Most carriers offer very good deals when trading in a good older phone when buying a new one. Verizon was offering about $500 for older smartphones when purchasing a new iPhone 7. Those deals only last about a month, but that's $500 off the $800 price of a new iPhone. Now you only have to pay for the phone service and the remaining balance spread over 24 months. Again, if you have a functional smartphone, wait and see if you can get more than it's worth by trading it in for a new phone.

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If you're trying to save for school, spread the payments over two years with one of the carriers. The monthly payment should not be that much… About $35 plus tax. You'll be able to put some money away in savings or investments, without having to lay down $800 right now.

What is the interest rate? Why waste money paying interest? Technically you are not saving if you are carrying short term debt.

Pay cash upfront if you can, and get cell phone insurance or AppleCare Plus, unless you can afford to pay cash again, to replace the phone should it get lost, stolen or destroyed, 24 hours after you buy it.

If the only way you can afford that phone, is to make monthly installments, you can't afford the phone if you do not also get cell phone insurance or AppleCare Plus, allowing you to pay a deductible to replace the phone should it get destroyed during your first 2 years of use. If you don't, you can't afford the phone (any phone for that matter).