You can set ChatGPT as your default Android assistant now. Here's how
Briefly

The recent update to the ChatGPT Android app allows users to designate the AI as their default voice assistant, an option previously available only for Perplexity. While this feature enables launching ChatGPT using familiar methods like long-pressing the home button, it doesn't support voice activation as Gemini does. Users will lose some functionalities such as managing Google Home devices or calendar settings. Therefore, the decision to switch largely depends on individual preferences for conversational quality over integrated Google services.
ChatGPT's latest Android app update allows users to set it as their default voice assistant, replacing Gemini, but with some limitations on functionality.
Users can launch ChatGPT through various methods on their Android device, but cannot trigger it by voice like they can Gemini, limiting its use.
Read at ZDNET
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