OpenAI added support for plugins and apps connected to the account in ChatGPT Voice. The capability is available on Web, iOS and Android, and each app's existing permissions and usage limits also apply in voice conversations.
You can therefore ask ChatGPT to use a connected service without first switching to a text conversation. Support does not bypass permissions or approvals required to perform actions.
Voice is now also available in ChatGPT Work on Web and mobile. Usage there requires access to both Voice and Work.