This is easily done by using the Import feature. This module is already equipped with various interfaces.
Desktop Browsers: There is a block „Import Your Contacts“ on the right side of the homepage, just select any button or click on View more. You can also follow this link and you will be redirected to the page Contact Importer.
Mobile phone browsers/app: In the side menu of you mobile browser you can find the item „Members“. There is a plus sign at the top right corner of the page that opens. Select it and you will find yourself on a page for importing contacts.
