A mobile phone isn't just a mobile phone any more. Smartphones and other mobile devices give us tools and abilities to enhance our daily life - we can check our email from anywhere, surf the web, pay bills, use social media... add an iPad or other tablet to that, with its word processing and other office apps, and you have a device that can, for the most part, be a notebook/laptop replacement when you're out and about.
These devices are growing in popularity so quickly that website design technology now has to take them into account and change to allow for the limitations and capabilities of these devices.
There is an excellent article here by Siobhan Ambrose on making your WordPress website mobile-friendly. The advice in here is quite applicable to any website, not just one driven by WordPress. Siobhan cites some big predictions from Gartner Research on the rapidly increasing use of mobile technology.
These include: "By 2013, mobile phones will overtake PCs as the most common Web access device worldwide. According to Gartner’s PC installed base forecast, the total number of PCs in use will reach 1.78 billion units in 2013. By 2013, the combined installed base of smartphones and browser-equipped enhanced phones will exceed 1.82 billion units and will be greater than the installed base for PCs thereafter." Wow!
And also, "Mobile Web users are typically prepared to make fewer clicks on a website than users accessing sites from a PC. Although a growing number of websites and Web-based applications offer support for small-form-factor mobile devices, many still do not. Websites not optimized for the smaller-screen formats will become a market barrier for their owners — much content and many sites will need to be reformatted/rebuilt."
Websites that use Cascading Style Sheets (CSS) rather than tables have the advantage. CSS can expand and contract as you zoom on your mobile device. Tables can look awful on mobile devices, so if you've got a site you designed yourself a few years ago using FrontPage or similar software, it's time to think of updating and moving to a Content Management System (CMS) site driven by Joomla! or WordPress or similar software. (There's also SquareSpace, but I don't believe it offers the same value as WordPress as there is a monthly charge to use it and limited templates at this stage.)
WordPress makes it easy to update on the go with a free WordPress app for iPhone and iPad. There are also versions available for Nokia, BlackBerry and Android from Automattic.
I've been testing IoS for WordPress and find it easy enough to use on both an iPhone and iPad. See the website here for IoS WordPress. This app works whether or not you have a blog hosted on WordPress or your own website. If you manage multiple blogs, you can manage them all from your mobile device - how easy is that! The pic at right shows it in action, courtesy of the IoS site.
I'm still investigating a Joomla! mobile editor, but if you want real flexibility for updating anywhere, anytime, head for WordPress and its mobile editing apps.