There&#x27;s not 4, there&#x27;s 2: the 6S and the 6S Plus.<p>Just two flagships. And they are differentiated on size, that&#x27;s all.<p>This is no different to the 5&#x2F;5C situation really (in fact, a clearer differentiation tbh).<p>The previous years models have always been available since the 3GS was released.<p>Seems like you&#x27;re running about 6 years behind the times...?