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It looks like Apple’s back-to-school shopping promotion has done good things for the company’s sales of iPhones, according to a new report by ComScore.

Apple’s piece of U.S. smartphone market share increased from 41.4 percent in April to 42.4 percent in July, maintaining the company’s position as the leading single smartphone maker in the U.S. Samsung’s share grew by seven-tenths of a percent to 28.4 percent of the overall market during the same period.

Those gains came at the expense of other Android OEMs, though. Motorola, HTC and LG all lost share over the three month period ComScore measured, and both Motorola and HTC saw their piece of the market shrink from June to July.

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On the operating system side of things, Android’s share of the market declined from 52.5 percent in April to 51.5 percent in July. That doesn’t mean the sky is falling for Google’s smartphone OS – it was down at the same point in December of last year, and usually fluctuates around 51 or 52 percent.

The report does come with a smidgen of good news for Microsoft. Windows Phone posted slight gains, and now represents 3.6 percent of the U.S. smartphone market, compared to 3.3 percent in April.

After being continually hammered in the first half of the year, BlackBerry seems to have slowed its market share decline. The company is holding steady with 2.3 percent of the U.S. market, which is flat from where it was in April.

The report is good news for Apple, as the company heads toward a major press event on September 9, where it’s expected to announce a new iPhone, as well as a wrist-mounted wearable device.

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