The rapid increase in the number of new smartphones in developing countries been accompanied by a corresponding increase in mobile marketing because .

has not; the enabling wireless data are still very expensive.

Explanation:

Although there is significant proliferation of smartphones in developing countries due mostly to technological globalization, this proliferation has not had the expected corresponding mobile marketing due in great part to the fact that wireless data which is a key driver of mobile marketing is yet to be sufficiently affordable by the majority of mobile phone owners in those countries.

Expensive data services is as a result of the harsh operating environments of the service providers. Wireless telecommunication providers in developing countries often grapple with high cost of operations owing to unstable power supply, infrastructure vandalism and general insecurity, issues they all have to factor into pricing their services.