“Recently, I actually did switch to an Android phone,” he said, speaking on Fox News on Sunday.
Microsoft’s own Windows-powered phones have failed to make a significant impact on the smartphone market, which is dominated by devices running Google’s Android operating system.
However, Mr Gates said he had installed lots of Microsoft apps on his phone.
When asked whether he also had an iPhone, perhaps as a secondary device, he replied: “No, no iPhone.”
He did not reveal which particular smartphone he currently uses.