"lately, I truely did switch to an Android smartphone," he said, speakme on Fox information Sunday.
Microsoft's personal home windows-powered phones have didn't make a massive impact on the telephone market, that's dominated by means of gadgets running Google's Android operating system.
But, Mr Gates stated he had established lots of Microsoft apps on his smartphone.
When asked whether or not he also had an iPhone, perhaps as a secondary tool, he responded: "No, no iPhone."
He did now not reveal which specific phone he currently uses.
Microsoft struggled to make a fulfillment of its very own cellular operating machine, windows smartphone.
In 2014, the software large paid $7.2bn (£five.5bn) for Nokia's handset commercial enterprise, but windows-powered telephones accounted for fewer than 1% of worldwide telephone sales in 2016.
Microsoft's modern operating gadget, home windows 10, can power smartphones in addition to laptops, capsules and laptop computer systems. but, few windows 10 smartphones have been released.
In April, Microsoft started out selling a personalized model of Samsung's Galaxy eight cellphone in its US shops.
"Microsoft's strategy under its modern leader executive Satya Nadella is to make Microsoft apps and offerings widely available on Android and iPhone," stated Ian Fogg, an analyst at the tech consultancy IHS Markit.
"it really is wherein their customers are in recent times."
The "Microsoft version" cellphone comes with the firm's apps inclusive of office, Outlook e mail and its voice assistant Cortana blanketed.
"It used to be putting the home windows operating device on anyone's telephone was a priority, but now it's about selling offerings together with office and Outlook email," said Mr Fogg.
"To do that, you need to make those services available on each tool."
