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 ...
Techno-Science.net

4 Best Ways to Transfer Contacts from Android to Android

Google Contacts lets you transfer contacts between Android smartphones by syncing them with your Google account. Alternatively, you can share contacts using VCF files. This article covers these ...

How to transfer your contacts from an iPhone to an Android in 3 ways

You can transfer contacts from an iPhone to an Android phone using Google Drive, Gmail, or a "vCard" file.

Android to Android: The Easiest Way to Transfer WhatsApp

Learn how to transfer WhatsApp messages and media between Android phones with this step-by-step guide. No data loss, seamless ...
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 ...