LinuxQuestions.org - second interface doesn't work

Hi all,

I have two simultaneous active mobile connections through my two mobile phones and USB data cables. Yet I can only send/receive with one connection.

Each of the phone modems have a node in /dev, namely ttyACM0 and ttyACM0. So the modems are detected correctly.
After setting up two dial-up connections with the two modems I have two ip's. Ifconfig-a confirms this:

ppp0 Link encap:Point-to-Point Protocol
inet addr:10.10.219.60 P-t-P:10.6.6.6 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:15209 errors:0 dropped:0 overruns:0 frame:0
TX packets:13505 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:17321029 (17.3 MB) TX bytes:1308173 (1.3 MB)

ppp1 Link encap:Point-to-Point Protocol
inet addr:10.10.198.137 P-t-P:10.6.6.6 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:64 (64.0 B) TX bytes:97 (97.0 B)

So the network interfaces are running and are up.

When I do a wget with
'wget --bind-address=10.10.219.60 http://www.google.com/intl/en_ALL/im...rpr/logo1w.png'
the file is downloaded correctly.
Yet when I do a wget with the other interface ('wget --bind-address=10.10.198.137 http://www.google.com/intl/en_ALL/im...rpr/logo1w.png'), the download wont start.
The same problem occurs with ping:
'ping -I 10.10.219.60 www.google.com' works fine while
'ping -I 10.10.198.137 www.google.com' doesn't receive anything.

Does anyone know how to make the second interface operational?
Thanks.