Dumb question about Nitrotablet1

Maybe a dumb question, but the info for the Nitrotablet1 states:

Phone calls are made with optional headset

As there’s no provision for SIM/eSIM that I can see, I assume this means a SIP/VOIP phone?

Yes, there is no SIM/eSIM support in the tablet. You can use any SIP/VOIP/Messenger application you like though. The only requirement is that it works on GrapheneOS.

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