While overall cellphone sales were down in the first quarter, sales of integrated devices jumped 12.7 percent compared to last year, meaning that more than 36.4 million smartphones were shipped in Q1. Nokia continues to retain the lion’s share of the smarpthone market at 41.2 percent, but its lead is slipping. Last year, it had a 45.1 percent slice. Apple, meanwhile, had the biggest growth in sales. The iPhone’s market share doubled in the first quarter compared to last year to 10.8 percent, with approximately 3.9 million iPhone’s shipped. The second largest smartphone maker in Q1 was Research In Motion, whose Blackberry devices gave it a 19.9 percent share.