From Forum Nokia Wiki

ID	TSS000274	Creation date	July 21, 2005
Platform	Series 80 2nd Edition	Devices	Nokia 9300, Nokia 9500
Category	Symbian C++	Subcategory	General

Keywords (APIs, classes, methods, functions):

Overview

Switch Automatically" in Internet Connection setup

Description

There is a check box labeled ’Switch Automatically’ in Internet connections setup.  What does this do?
Symbian OS 7.0s starts a connection by trying each connection in the preference table in order — dropping down to the next one in the list if it cannot start the current one. But does the automatic switching imply that if you are currently connected with a lower-priority connection and a higher-priority one suddenly becomes available, that the system will automatically switch from the current connection to the now active preferred connection?

Solution

This check box is not operational in current software versions.
The system will not switch back from a lower-priority connection to a higher-priority connection. If this would happen, you would loose your IP address in the transition, and all connections would break.