"Google's Android and Apple's iOS mobile platforms together accounted for a record 92 percent share of all smartphones shipped worldwide in the fourth quarter of 2012, according to new data from Strategy Analytics.
Android, the undisputed leader of the industry, captured an impressive 70 percent share of the global smartphone market in Q4 2012, up from 51 percent a year earlier, the research firm said. Apple's iOS took 22 percent during the period, and all other smartphone platforms combined accounted for the remaining 7.9 percent.
"The worldwide smartphone industry has effectively become a duopoly as consumer demand has polarized around mass-market Android models and premium Apple designs," Scott Bicheno, senior analyst at Strategy Analytics, said in a statement."http://www.pcmag.com/article2/0,2817,2414764,00.asp
while it is true, it is a duopoly looking like a monopoly, this particular one seems to be the most unstable one i have seen, a decent competitor can take it down in a year, just like android did with ios