The report found RIM grabbed 44.5% of the market for the first three months of 2008, up from 35.1% in the previous quarter.
RIM has successfully been able to broaden the appeal of the BlackBerry to more than just professionals, said IDC analyst Ramon Llamas. With new consumer-friendly devices like the BlackBerry Thunder and the BlackBerry Bold, RIM is well-positioned to be a strong presence in the "prosumer" segment.
Apple's iPhone came in second place with 19.2% of the market in the first quarter, a drop from 26.7% the quarter before.
One reason may be that the fourth quarter included the holiday shopping season. More recently, consumers may be wary of purchasing an iPhone when there's reportedly a 3G version right around the corner (although, there's a report of a delay).
Palm found itself in third place with 13.4% of sales, up from 7.9% in the fourth quarter. One key factor was the release of the Centro in February, IDC said.
Samsung was in the fourth slot, with 8.6% of the market, up from 5.1% the previous quarter.
Things weren't as positive for Motorola or High Tech Computer. Continuing on a downward trend, Motorola dropped from 7.5% share in the first quarter to 2.6% in the first. HTC's share fell to 4.1% from 7.9% in the previous quarter, the report found.
IDC did not reveal the total number of smartphones sold in either quarter.