If you no longer need the data on the Note and have it backed up and restored to you current device then you can reset the Note to remove all configuration and memory. Theoretically, that should change the unknown config on your current device when t...
How long ago did you swop? The cause for the Unknown number is because the number is registered to the Note. Nothing that you can really do to fix this. Hopefully a future software update will rectify it.Is the Note in use?
Do you get permission from the people on the other side to record the calls? It's illegal to record a call without notifying the other person and getting their consent.
Check if your phone backed up the photos to Google Drive or OneDrive. Check the bins in there.If you deleted the chat and chose to delete the media in the chat then you will lose them from the on-board memory.