Gemini has officially replaced Google Assistant on mobile devices, a transition that began last year. Google has phased out the option to revert to Google Assistant, with the removal process starting in September and affecting various devices including smartphones and tablets. Users have reported that the switch-back option is disappearing from the Gemini app. While Nest and Google Home speakers currently retain Google Assistant, vehicles with Google built-in will continue to support it. Some users have expressed dissatisfaction with Gemini, noting it lacks certain features of Google Assistant and has issues with accuracy in responses.