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You can buy attachments in step 2 of the checkout. They mention having cellular as an option on the description:

> LTE or 5G Modems

> Add mobile data and calling support to your Comet. Bring your own modem and antenna or use our standard LTE upgrade kit.

I notice they haven't developed a dialer app for it yet which seemed a bit weird.

One of the people on discord came up with a dialer concept!

Creator here,

We haven't because it isn't primarily a phone. But we will eventually. But the folks at PlaMo are testing their dialer app and it works fine.

It looks sick! good luck with the project

That's cool!