Can I log in and use two iPhones with one ID?

I've been using iPhone for a long time, so I've got two phones, the one I used and the one I recently opened.

Can I log in and use two iPhones with one ID?

I don't know what happens if I log in to a new iPhone with my old ID.

Should I say it's a simultaneous connection?

Or is the same connection blocked?

1492 2017-08-02 Gentleman

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