Internet giant Google may be soon expanding its portfolio to include a new phone service. According to a report in Washington Post, Google has sent out invitations to an experimental telephone service to some of its high-speed internet subscribers. . . The report quotes two people who have received the invitations. The invites reportedly have been circulating for over a month to members of the Google Fiber Trusted Tester program. The programme involves Fiber subscribers who have opted to try new and potential changes to their service. . . According to the report, "The service, known as Google Fiber Phone, closely resembles another Google product, Google Voice. That application lets users link all of their various telephones, including landline and mobile devices, to a single phone number. Fiber Phone comes with Google Voice features, such as voicemail transcriptions and automatic call screening based on the time of day." The Washington Post report further notes, "it wouldn't be much of a leap for Google to begin offering its broadband subscribers bundled access to Project Fi, Google's recently launched cellular service that hops between Sprint, T- Mobile and WiFi. As many cable companies mull an entry into the competitive wireless market, it appears Google may already be positioning itself to get ahead of them." . . Incidentally, Google's parent company Alphabet Inc surpassed Apple Inc as the most valuable company in the United States in after-hours trading on Monday, knocking the iPhone maker from the top spot that it has held for the better part of four years. . . After reporting strong quarterly earnings, the company said that among its 'other bets', it had spent the most capital on Google Fiber, its high-speed broadband service. . . Google includes its search engine, YouTube and related parts of the company, while a unit called 'Other Bets' includes its 'moonshots' such as self- driving cars, and encompasses Google Capital, the secretive X research division and Nest, which offers smart-home accessories...