How to transfer contacts from any phone to a Samsung Galaxy S10 in 2 ways

Using files known as vCards, you can easily transfer contacts to your Samsung Galaxy S10 from an Android or iPhone. Here are ...
Ars Technica

Moving contacts and SMSs from a Nokia 1100 to an Android phone: is it possible?

If she's using the same SIM card, she can easily transfer contacts herself. If not and you're on AT&T, take both phones to a company-run store and they'll transfer them over for free. T-Mobile will ...