Hi manisha3998536 Yes it is possible to create different audiences for iphone 6, 7 etc. However please note that Apple devices don't share device model-specific tokens in the UA. To solve this, Target collects additional data to accurately detect iPhones and other Apple devices using the following parameters:devicePixelRatio, screenOrientation and webGLRenderer . To take advantage of this you will need to be on at.js version 1.5.0 or higher.
More details on the same can be found here Mobile .