I did some tests and network manager can now see my card but the connection doesn't work...

To see my card working with network manager I did :
sudo stop network-manager
sudo killall modem-manager; sudo modem-manager
sudo NetworkManager --no-daemon

NetworkManager: <debug> [1258055138.000790] ensure_killed(): waiting for ppp pid 2494 to exit
NetworkManager: <debug> [1258055138.257498] ensure_killed(): ppp pid 2494 cleaned up
NetworkManager:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
NetworkManager: Tried to set deprecated property gsm/band
NetworkManager: <info>  Activation (noz0) starting connection 'Orange Business'
NetworkManager: <info>  (noz0): device state change: 3 -> 4 (reason 0)
NetworkManager: <info>  Activation (noz0) Stage 1 of 5 (Device Prepare) scheduled...
NetworkManager: <info>  Activation (noz0) Stage 1 of 5 (Device Prepare) started...
NetworkManager: <info>  (noz0): device state change: 4 -> 6 (reason 0)
NetworkManager: <info>  Activation (noz0) Stage 1 of 5 (Device Prepare) complete.
NetworkManager: <info>  Activation (noz0) Stage 1 of 5 (Device Prepare) scheduled...
NetworkManager: <info>  Activation (noz0) Stage 1 of 5 (Device Prepare) started...
NetworkManager: <info>  (noz0): device state change: 6 -> 4 (reason 0)
NetworkManager: <info>  Activation (noz0) Stage 1 of 5 (Device Prepare) complete.
NetworkManager: <info>  Activation (noz0) Stage 2 of 5 (Device Configure) scheduled...
NetworkManager: <info>  Activation (noz0) Stage 2 of 5 (Device Configure) starting...
NetworkManager: <info>  (noz0): device state change: 4 -> 5 (reason 0)
NetworkManager: <info>  Activation (noz0) Stage 2 of 5 (Device Configure) successful.
NetworkManager: <info>  Activation (noz0) Stage 3 of 5 (IP Configure Start) scheduled.
NetworkManager: <info>  Activation (noz0) Stage 2 of 5 (Device Configure) complete.
NetworkManager: <info>  Activation (noz0) Stage 3 of 5 (IP Configure Start) started...
NetworkManager: <info>  (noz0): device state change: 5 -> 7 (reason 0)
NetworkManager: <info>  Starting pppd connection
NetworkManager: <debug> [1258055216.265407] nm_ppp_manager_start(): Command line: /usr/sbin/pppd nodetach lock nodefaultroute user orange noz0 noipdefault noauth usepeerdns lcp-echo-failure 0 lcp-echo-interval 0 ipparam /org/freedesktop/NetworkManager/PPP/4 plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so
NetworkManager: <debug> [1258055216.269425] nm_ppp_manager_start(): ppp started with pid 2524
NetworkManager: <info>  Activation (noz0) Stage 4 of 5 (IP6 Configure Get) scheduled...
NetworkManager: <info>  Activation (noz0) Stage 3 of 5 (IP Configure Start) complete.
NetworkManager: <info>  Activation (noz0) Stage 4 of 5 (IP6 Configure Get) started...
NetworkManager: <info>  Activation (noz0) Stage 4 of 5 (IP6 Configure Get) complete.
Plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so loaded.
** Message: nm-ppp-plugin: (plugin_init): initializing
** Message: nm-ppp-plugin: (nm_phasechange): status 3 / phase 'serial connection'
Removed stale lock on noz0 (pid 2494)
NetworkManager:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
NetworkManager:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Using interface ppp0
Connect: ppp0 <--> /dev/noz0
** Message: nm-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
NetworkManager: <WARN>  pppd_timed_out(): Looks like pppd didn't initialize our dbus module
NetworkManager: <info>  (noz0): device state change: 7 -> 9 (reason 14)
NetworkManager: <info>  Marking connection 'Orange Business' invalid.
NetworkManager: <info>  Activation (noz0) failed.
NetworkManager: <info>  (noz0): device state change: 9 -> 3 (reason 0)
NetworkManager: <info>  (noz0): deactivating device (reason: 0).
NetworkManager: flush_routes: assertion `iface_idx >= 0' failed
NetworkManager: flush_addresses: assertion `iface_idx >= 0' failed
Terminating on signal 15
** Message: nm-ppp-plugin: (nm_phasechange): status 10 / phase 'terminate'