Will Apple and Samsung Hit the Wall?

As much as device suppliers ranging from Nokia to BlackBerry to LG to Motorola are trying to survive, not necessarily catch Samsung and Apple in the market share race, even Apple and Samsung face key issues. 

The primary problem for Apple is that the market for high-end smartphones is nearing saturation, according to Adnaan Ahmad at Berenberg Bank. 

As a result, demand for the newest iPhone, which was the main driver of Apple's growth, is softening. 

Citigroup, for example, has updated its revenue growth model for Apple, predicting single digit growth.

Samsung is going to face the same problem, some would argue.