Hey Ev201,
You could use your headphones with the Tab One, and yes, you can do video calling with apps that support this, like Google Meet, for example. Also, you don't necessarily need any accessories for the device to function, but cases and screen protectors are available to help protect the device, along with others, like Bluetooth keyboards (see one here at Best Buy: https://www.bestbuy.com/product/lenovo-multi-device-wireless-keyboard-luna-gray/JJGYCC4RHW) if you plan to type a lot for writing.
We hope that this satisfies your inquiry complete, and please feel free to reach out to us with any other questions!
12 hours ago
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Lenovo Product Expert