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I can connect mobile-network over GPRS using pon but connecting using
NetworkManager fails. Pon uses this simplest chatscript for
connection:

ABORT           BUSY
ABORT           VOICE
ABORT           "NO CARRIER"
ABORT           "NO DIALTONE"
ABORT           "NO DIAL TONE"
""              AT+CGDCONT=1,"IP","internet"
OK              ATDT\T
CONNECT         ""

There are logs of NetworkManager and modem-manager in attachments, done this
way:
/etc/init.d/network-manager stop
kill pid-of-modemmanager
NM_SERIAL_DEBUG=1 modem-manager --debug 2>&1 | tee /tmp/mm-testing-modem.txt
NM_SERIAL_DEBUG=1 NetworkManager --no-daemon 2>&1 | tee
/tmp/nm-squeeze-modem.txt
LAN connection raised by NM
then I plugged the phone in, and choose configured mobile-net from the
applet's menu

I couldn't connect with squeeze's modem-manager, I updated it to testing but
still I can't.
I've heard somewhere in the net, people had had success with Motorola C380 +
NetworkManager in Ubuntu 8.10... possible regress? May be I try some day
that old distro.