How would returning an iPhone X work?

[DotCom2]

I've had all iPhones from the 3G on and never had to return one.
I am not sure I am going to like the new X coming from the 7Plus but I want to still order the X when they become available and try it.
My question is:
If I decide I don't like it and want to return it, how would that work exactly?
I would be tied to the AT&T next plan and still have my old phone (7 Plus) available to go back to.
Would I need to take both phones in? And would I take them to Apple or AT&T?
Who has actually done this before?
TIA

 

[Cryates]

In your case, you would just have a 14-day return policy and everything would go back to how it was prior to the purchase. You could take the SIM from the iPhone X and pop it in your 7 Plus.

 

[DotCom2]

In your case, you would just have a 14-day return policy and everything would go back to how it was prior to the purchase. You could take the SIM from the iPhone X and pop it in your 7 Plus.

I thought they had different size sims but I'm not sure.

 

[Gathomblipoob]

I thought they had different size sims but I'm not sure.

The 7 Plus and X use the same size SIM.

 

[DotCom2]

The 7 Plus and X use the same size SIM.

Thank you!