Smartphone adoption is increasing rapidly in Japan with more than 24 million people owning such devices now, representing 23.5 percent of the entire mobile population.

According to comScore's findings released on Tuesday, smartphone uptake has grown 43 percent in 2012 compared to end-2011. The study surveyed more than 4,000 Japanese mobile subscribers.

Of the mobile platforms available, Android was the most popular among consumers as it took a 64.1 percent market share during the three months ended June, which was a 1.9 percent increase over March's figures. Apple's iOS came in at second with 32.3 percent while Microsoft's Windows Phone represented 3.2 percent, it noted.

Sharp continued to be the top phonemaker in the land as it cornered 22.6 percent of the mobile handset market, followed by Panasonic with 13.6 percent. Fujitsu, NEC, and Sony rounded up the top five in that order.

However, in terms of percentage difference between March and June, Sharp saw the biggest drop at 0.8 percentage points while Sony grew by 0.7 percentage points, the report stated.