Analysing the data from the 52.6 billion impressions it hosted in North America (including Mexico) on smartphones and feature phone during the three months, it says Apple's share of the market - which includes iPhone, iPad and iPod touch - was up 3.7 percent to 36.8 percent.
Android was up 1.6 percent to 34.1 percent, with RIM losing out. Its share of the regional ad market dropped 4.6 percent to 7.3 percent.
System of change
InMobi saw overall activity in the US market up 18 percent during those 90 days.
"We will see further disruption if devices such as the much anticipated Amazon smartphone and Google tablet hit the US market this year," said Anne Frisbie, InMobi's VP and MD, North America.
"Momentum surrounding Windows 8 could also change the market significantly."
Nokia's sustain
On a global basis things were somewhat different.
Analysing the almost 283 billion ad impressions InMobi handled in Q1, Nokia continues to maintain its #1 standing in terms of OEMs, with 35 percent of activity on InMobi.
Samsung and Apple are in close second and third place, with 19 and 18 percent respectively.
InMobi's global activity was up 21 percent during the period.
In both North America and globally, the top four devices are iPhone, iPod touch and iPad (in that order), with the BlackBerry 8520 in fourth place.
Also, while iOS and Android are running neck-and-neck in North America, Android is now strongly ahead in terms of the global market.
Platform share on InMobi in North America
Platform share on InMobi globally
[source: InMobil]
