Don't break wwan connection when user set's force edge

[asdil12]

When a user connetc's to the mobile network and get's a 3G or HSDPA connection, and then selects 'force EDGE' from the menu (after the connection is established) the

• Connect to Mobile Network
• Wait until Connection to 3G/HSDPA is established <BROADCAST,MULTICAST>
• Set force edge
• You will get <NO-CARRIER,BROADCAST,MULTICAST,UP>

The connection might have to be disabled before and enabled afterwards, or only reinitialized afterwards.

This problem also occures, when the card looses connection to the network, or maybe, when a handover fails.
The card won't reconnect by itself. Manual user interaction and a complete wwand is needed atm to reconnect.

This may also be specially related to handovers to and from 3G-Based modes - but a general issue with non-900MHz networks is also posible.