Therefore the iPhone share of total search ad spend is about $3B.  This link puts the overall market (inclusive of Android) at roughly $9B in 2014.  That makes sense if you assume iOS to represent roughly 1&#x2F;3 of devices.<p><a href="http:&#x2F;&#x2F;www.emarketer.com&#x2F;Article&#x2F;Mobile-Account-More-than-Half-of-Digital-Ad-Spending-2015&#x2F;1012930" rel="nofollow">http:&#x2F;&#x2F;www.emarketer.com&#x2F;Article&#x2F;Mobile-Account-More-than-Ha...</a>