What can I access on a different IPhone that uses the same Apple ID?

So my mum is using my old iPhone 5, and I got a new iPhone.
My old iPhone is still using my Apple ID, as well as connected to iCloud, and has photo stream, and uses iTunes on my laptop.

I was wondering if I would access to any contacts, messages, photos or anything on that old iPhone without actually going on the iPhone? Because I don't know the passcode.

Or if there's anyway to get into the phone?

Well since it is signed into the same Apple ID then you'd be able to see what it sees. More importantly that iPhone 5 would as well, including iMessages, FaceTime audio/video calls, Photo Streams, etc

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