Mobile marketing is not just for smartphones
Though smartphone shipments are rising and expected to surpass shipments of feature phones in 2011, according to Morgan Stanley, feature phones are still the devices in the hands of most mobile users. An April 2010 ExactTarget study found 58% of all US internet users ages 15 and older had one, compared with 31% who had a smartphone.
That means a large swathe of mobile users cannot be reached by more sophisticated mobile marketing efforts like sponsored apps, in-app ads or....