Core FTP LE is a free Windows software that includes the client FTP features you need. Features like SFTP (SSH), SSL, TLS, FTPS, IDN, browser integration, site to site transfers, FTP transfer resume, ...
When it comes to smartphones, you're more likely to think of standards such as wifi, Bluetooth, and NFC (Near Field Communication) before the old FTP (File Transfer Protocol) technology comes to mind.
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