This is to suggest web designers include a "classic" option in their web pages, for users with low bandwidth, high latency Internet connections. This could be incorporated in Responsive web design (RWD).
In practice it may not be worth designing web pages for "dumb" mobile phones. In Australia half the population now have smart phones and it is unlikely that many people will be bothered trying to operate a web interface on a tiny dumb phones without a touch screen.
As an example, the email service FastMail offers a classic interface which can be selected by the user from the log in screen. Unfortunately there seems to be no way for the user to set this as their preferred option and they have to select it each time they log in. In contrast LinkedIn offers no classic interface, making low speed browsing difficult.