Yes, Facebook may access and utilize information on your phone if you have given the app permission to do so.
For example, if you have allowed Facebook to access your phone's contacts, the app may use that information to suggest friends or to display profile pictures of people you know. Facebook may also access your phone's camera and microphone if you have given it permission to do so, which allows you to take and share photos or videos directly from the app.
Additionally, Facebook may collect data about your device, such as your phone's operating system, hardware model, and unique device identifier, as well as information about your internet connection and usage of the app. This data is used to personalize your experience on the platform and to provide you with targeted advertisements.
It's important to review and manage the permissions you have given to the Facebook app and to be aware of how the app is using your data. You can do this by going to your phone's settings and reviewing the app permissions, or by checking the Facebook app settings within the platform.