a character in Robert Heinlein's Future History has a mobile phone but also shares the Solar System with Martians, Venerians, Callistans etc;
Dan Dare's timeline had a world government and an Interplanetary Space Fleet but neither Sterling decimalization nor inflation;
characters in Poul Anderson's The Star Fox/Fire Time diptych use "infotrieves" to access what we would call the internet but also travel in the ubiquitous "aircars" of much futuristic sf;
characters in Jerry Pournelle's CoDominium future history have multipurpose pocket computers but write on them with styluses.
Thus, sf, coming from our past, moves forwards but also sideways in time.
(In 1956, while the overweight spaceman, Nicholas van Rijn, was being introduced in Poul Anderson's "Margin of Profit," I was being introduced to sf by Dan Dare, which featured the overweight spaceman, Digby. Heinlein, Anderson and Pournelle are, of course, three successive American future historians.)