Well, not really. If you have unpacked the iphone - I'm pretty sure it's not gonna be easy to return even within the 14 day window. You can return unpacked though, which is not the point of what I'm saying. Also for the benefit of the argument, change 2 days to 15 and you end up at the same place- you cannot legally return the device, User agreement has changed in ways you don't accept and you are forced to use device, for which you have paid or accept loss and buy another device. Oh and also, you cannot change OS to the alternative one for which terms might be more acceptable to you. How is this not a subject of investigation- I don't know.
Well, yes really. If it is 2 days, and you've bought it online then you can just bring it back.
ishouldnotbutk8's message was mostly a joke since your argument would work with 15 days instead of 2. And yes, customers should be protected* against altering the deal.
Especially that it is so so common now, with the wide-spread of IT. Companies just push out malicious updates and changes in terms and conditions.
* they probably already are, but not many people try to bring remote downgrade cases to courts
You can absolutely return it within the 14 day window, even unpacked.
During the reflection period, you may open the packaging. You may try or fit the product, just like in a normal store. But you are not allowed to do more than what is needed to judge the product. For instance, you can try pants. But you cannot wear the pants for several days and then return it. If you do this anyway and the product loses value? Then the seller may charge you the damage. The seller needs to inform you of this before you buy the product.
https://consument.acm.nl/aankoop-dienst-annuleren/bedenktijd
I have sent back products within the 14 days, including smartphones that I tried and decided that I don't like it. Some sellers also extend the 14 days to 30 days.
Changing the terms later is a completely valid point though and it should be possible to reject any updated terms IMO.