in addition, the users who don't have smartphones yet don't have very attractive demographics, and attention is saturated: https://key2.bluematrix.com/docs/pdf/570bbc5f-526e-482f-90ac...
in addition, the users who don't have smartphones yet don't have very attractive demographics, and attention is saturated: https://key2.bluematrix.com/docs/pdf/570bbc5f-526e-482f-90ac...