Does microsoft provides any sample device channel specific master page for windows phone or ios? Or can some one please share any sample device channel specific master page.
According to your post, my understanding is that you wanted to get some samples device channel specific master page for windows phone or ios.
You can refer to the following articles about Optimizing SharePoint 2013 websites for mobile devices
and Mobile devices and SharePoint 2013 – Part V: Custom Applications .
You also can refer to the following similar post:
There are some articles about device channel, you can have a look:
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