Apple's iOS and Google's Android platforms now account for 90 percent of smartphone subscribers in the U.S.
This news points to the two companies moving closer to a duopoly and the market share of other platforms dropping as they keep rising.
According to the latest numbers from comScore MobiLens for the U.S. mobile phone market, Apple controls 35 percent, while Samsung controls 53.7 percent.
ComScore's latest data tracks the 3-month period ending in Nov. 2012 and compares it to the three months ending Aug. 2012.
Apple's share grew from 34.3 percent to 35 percent and Google's share grew from 52.6 percent to 53.7 percent.
Other platforms such as RIM, Microsoft, and Symbian lost market share from the 3-month period ending in August to the 3-month period ending in November.
RIMs went from 8.3 percent to 7.3 percent, Microsoft dropped from 3.6 percent to 3 percent, and Symbian dropped from 0.7 percent to 0.5 percent.
ComScore also collected data on the Top Mobile OEMS during the same two 3-month intervals.
Samsung had the highest number of U.S. Mobile Subscribers with 25.7 percent in the 3-month period ending in August, and 26.9 percent in the 3-month period ending in November.
Apple had the second highest and also saw an increase in the period ending in November. The company finished with 17.1 percent in August and 18.5 percent in November.
Other smartphone companies such as LG, Motorola, and HTC lost OEMs to Samsung and Apple.
LG went from 18.2 percent in the three month period ending in August to 17.5 percent in the period ending in November.
Motorola went from 11.2 percent in the three month period ending in August to 10.4 percent in the 3-month period ending in November.
And HTC went from 6.3 percent in the period ending in August to 5.9 percent in the period ending in November.