Please attach /var/log/syslog right after trying a connection, also please let us know what software you're using to configure that modem.
NetworkManager typically never uses isc-dhcp-client for gsm modems, so I'd expect any other software to do the same, making this an issue with whatever that software is.
Please attach /var/log/syslog right after trying a connection, also please let us know what software you're using to configure that modem.
NetworkManager typically never uses isc-dhcp-client for gsm modems, so I'd expect any other software to do the same, making this an issue with whatever that software is.