1. Send the exported file to your phone, open the Contacts app on your phone, use the import function, select this file, and you will be able to import all your contacts to your phone.
2. No need to worry about data leakage, your files will not be uploaded to the server. This program was developed using browser HTML5 technology. If you don't worry, you can disconnect from the network after the page is loaded.
3. If you can't download the file normally by clicking the download button, try Chrome Google Chrome (Chrome for mobile phones and computers).