Apple's iPhone and Google's Android OS gained as Research in Motion (RIM) lost Blackberry market share in last three months, according to analyst, comScore.
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In the period ending May 2011, comScore's survey of 30,000 mobile users in the US found Google Android the top smartphone operating system (OS) platform with 38% of market share, showing an increase of 5%.
Apple also increased mobile OS market share with 27% of the market, an increase of 1%.
RIM (25%), Microsoft (6%) and Palm (2%) all lost market share over the period.
Samsung was the top handset manufacturer with 25% of market share.
LG followed Samsung with 21%, Motorola with 15%. Apple rose to fourth position (9%) while RIM dropped to fifth place (8%).
The market share declines for RIM follows a fall in shares. RIM' share price fell up to 17% in June 2011 after it announced its quarterly revenue could drop due to product delays.
RIM's share price was previously hit by its loss of US market share to Apple and Android and by the poor market response to the launch of RIM's Blackberry PlayBook tablet computer.
According to internet reports, a RIM employee recently wrote an open letter complaining to the company bosses of product delays and poor product quality.
Apple is expected to launch its fifth iPhone device by September 2011.