# Polite: This mode only connects to the MMS APN if no other connection is active.

# Rude: Automatically takes down your current connection, connects to the MMS APN and when it’s done reconnects to the previous connection if possible.

# Havoc: This is what other phone does (albeit much more reliably), it opens a second connection to the MMS APN in parallel with the one currently open. As an added bonus, the MMS APN is hidden from the “Connections” UI in this mode as it does not need to be visible.
Due to the nature of the kernel in Maemo 5 there are some ugly hacks involved in this, so if your current connection and the MMS APN configuration share the same network namespace, things might get ugly. Also, if the application fails in some way when opening/closing a connection in this mode it MIGHT lead to the modem not being able to open a new GPRS connection until a device reboot. You have been warned. Note: I’ve been using this mode for more than 3 months and not yet had it happen to me

From Frals blog