Design patents can not be applied to purely functional aspects, so no you can keep you wheel round and on the for your country correct side.
But you can have a design patent for the "looks and feel" of your headsup display to some degree. You can't make it cover what is one the display or that important parts are highlighted. But you can potentially cover the color pallet and how exactly you arrange information of the same not high importance level.
I.e. in context of JingOs the way they cluster settings especially combined with the used color schema and similar aspects are very likely covered by design patents.
Similar that notifications are a list of swipe-able settings in a box can't be covered by design patents, but that it has that graish color with that level of transparence, rounded corners, and similar might very well be covered.
I personally don't like design patents but they are a thing which exists.
Lastly the copy is so close that it might not just cause conflicts with design patents but also with copyright on the visual parts (not the underlying code!) of iOs.
You are probably right, but all these constraints are going to make old people and visually impaired people confused when switching to a different brand.
Would it be allowed for a vendor to add a button which makes the interface looks like a competitor's interface?
Clone is a subset of familiar — you don’t need to call your story about a wizard school “Barry Trotter and the Alchemist’s Gem” just to set your audience’s expectations, for example.
(I’m not a lawyer so have no idea if this JingOS legally OK or not, but there is a difference between familiar and clone).
