SAN FRANCISCO — Google wants the world to know that it has grown into a new identity — it is a mobile company now. The financial report it issued Thursday reflects the growing pains that have accompanied the transformation.

Advertising, Google’s main business, does not always make as much money on phones as it does on computers, and the price that advertisers pay for clicks on Google ads has decreased 16 percent since last year. And Motorola Mobility, the mobile device maker that Google now owns, is losing money.

Still, Google continues to chug along in its vast search advertising business and make headway in newer businesses like display advertising. Its core business, not including Motorola, had net revenue of $8.36 billion, less than the $8.41 billion that analysts had expected but up 21 percent over last year. Google did not break out net income for the two businesses, but for the combined company it climbed 11 percent. Google shares were up 2 percent in after-hours trading.

Google’s blossoming mobile strategy makes it even harder to differentiate among the big technology companies. Google, Apple, Microsoft and Amazon each have mobile devices, apps and cloud storage. And it is in those areas that the tech giants are competing.