I wanted to move one of my sim cards to a small dumb phone for calls only so that i can stop being online everytime, i.e go out without taking the bigger device. I then discovered that all phone numbers and messages were stored on the bigger device

I know i could export all contacts but the dumb phone has no otg/usb connection, manually typing out each number would also be a pain, so i got onto f-droid and found this app.

You can copy phone numbers from your device onto your sim card and vice versa, the sim card storage is your only limitation, mine could only take 100 and I didn’t even exhaust it