Smartphones are becoming immensely popular devices all around the world. In fact, they are portable mini computers that can be carried around anywhere. Many users now have a tough time imagining life without them as smartphones take on important roles in day to day activities.

But sometimes the so-called smartphones may look so smart. Every smartphone operating system has its quirks. They can be merely annoying or drive one to try another brand. What follows is an overview of each major OS -- and the glitches that can drive you crazy.