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It's an OS for mobile devices, no mention of "phones" on the project site (https://source.android.com) and lots of Android devices don't have cell service.

Doesn't seem unreasonable to bring your own dialing and voice calling app(s) if you want a UI for punching in formatted E.164 identifiers and making PSTN calls.

It would be like if a laptop came with no ... preinstalled apps to do a bunch of things that you might want to do with a laptop.

used to be... but android is a full fledged OS in a lot of things that are not phones (TVs, cars, streaming sticks, etc)