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smartphone is NO.1 now for every thing _ for me for sure whats app for respond.
Hmm.. If you mean by 'respond' as opening or clicking the ad. Then I would say SMS
i believe in SMS because it's more important to check as soon as possible & the audience should notice it but to be honest i belive it's can be effective with my regular clients more than new
nowadays , people use their smartphones for business and for everything ..
For me , responding to a promotional message sent by sms will be the best
