Having Two Phones, Need Apps

I would love to be able to switch to not an entirely dumb phone but mostly dumb.

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If there was a smart keyboard phone available right now, I'd switch but, as it stands everything is preorder.

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I was looking at downgrading to a BlackBerry but, realized how much I need my smartphone for every day tasks.

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My car, for example, is electric and I need the app to monitor and sometimes unlock it.

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Is there a best of both worlds? Does anyone use a keyboard phone for their texting and calling and a secondary phone for things like ordering an Uber or checking your bank?

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How does it work?