Nowadays a smartphone is much more a lifestyle choice or piece of fashion than a way to telnet into your server from the pub or manage an Exchange inbox.

FORBES: Apple, Android, Windows Phone, and 'The One Percent' of Technology Bloggers

In addition, you should consider avoiding plaintext-password network services: The POP3, FTP, and Telnet daemons pose a special risk because their passwords pass unencrypted across the open network, sniffable by any nearby machine along the way.

CNN: Analysis: Linux security