Web apps that can be accessed and update via SMS can make even old and/or simple phones useful for some PDA like functions.

The command line's making a comeback, but the terminal window, keyword launcher and search box aren't the only textual command interfaces-your cell phone has joined the party. More and more modern webapps let you interact with your data via SMS, updating and retrieving your information in the cloud on the go. You don't need a fancy mobile phone with a full-blown web browser to get organized with your favorite webapps. Your cell phone with simple text messaging capabilities can be your powerful mobile command line.

Link: http://lifehacker.com/software/geek-to-live/manage-your-life-via-sms-281793.php

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