Did you test your SIM in Windows?
Are you using LTE? I haven't successfully connected on 3G yet.
Here's what it looks like for me (phone numbers etc. redacted):
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.2172] device
(cdc-wdm0): Activation: starting connection 'Fido Default'
(d99245e5-39f0-4639-91e2-5f22f68d864b)
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.2174] device
(cdc-wdm0): state change: disconnected -> prepare (reason 'none') [30 40 0]
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.2180] device
(cdc-wdm0): state change: prepare -> need-auth (reason 'none') [40 60 0]
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.3527] device
(cdc-wdm0): state change: need-auth -> prepare (reason 'none') [60 40 0]
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Simple connect started...
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Simple connect state (4/8):
Wait to get fully enabled
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Simple connect state (5/8):
Register
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Simple connect state (6/8):
Bearer
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Simple connect state (7/8):
Connect
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Modem
/org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.3781]
(cdc-wdm0): modem state changed, 'registered' --> 'connecting' (reason:
user-requested)
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Modem
/org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected)
Sep 06 13:08:39 t460s ModemManager[3309]: <info> Simple connect state (8/8):
All done
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6287]
(cdc-wdm0): modem state changed, 'connecting' --> 'connected' (reason:
user-requested)
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6308] device
(cdc-wdm0): state change: prepare -> config (reason 'none') [40 50 0]
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6311] device
(cdc-wdm0): state change: config -> ip-config (reason 'none') [50 70 0]
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6314]
(cdc-wdm0): IPv4 static configuration:
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6314] address
25.157.105.182/30
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6314] gateway
25.157.105.181
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6314] DNS
64.71.255.254
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6315] DNS
64.71.255.253
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6377] device
(cdc-wdm0): state change: ip-config -> ip-check (reason 'none') [70 80 0]
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6399] device
(cdc-wdm0): state change: ip-check -> secondaries (reason 'none') [80 90 0]
Sep 06 13:08:39 t460s NetworkManager[3225]: <info> [1473181719.6452] device
(cdc-wdm0): state change: secondaries -> activated (reason 'none') [90 100 0]
$ mmcli -L
Found 1 modems:
/org/freedesktop/ModemManager1/Modem/0 [Sierra] MBIM [1199:9079]
$ mmcli -m 0
/org/freedesktop/ModemManager1/Modem/0 (device id
'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
-------------------------
Hardware | manufacturer: 'Sierra'
| model: 'MBIM [1199:9079]'
| revision: 'SWI9X30C_02.08.02.00'
| supported: 'gsm-umts, lte'
| current: 'gsm-umts, lte'
| equipment id: 'XXXXXXXXXXXXXXX'
-------------------------
System | device: '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2'
| drivers: 'cdc_mbim'
| plugin: 'Sierra'
| primary port: 'cdc-wdm0'
| ports: 'cdc-wdm0 (mbim), wwp0s20f0u2i12 (net)'
-------------------------
Numbers | own : '+1XXXXXXXXXX'
-------------------------
Status | lock: 'none'
| unlock retries: 'sim-pin2 (5)'
| state: 'connected'
| power state: 'on'
| access tech: 'lte'
| signal quality: '9' (cached)
-------------------------
Modes | supported: 'allowed: 3g, 4g; preferred: none'
| current: 'allowed: 3g, 4g; preferred: none'
-------------------------
Bands | supported: 'unknown'
| current: 'unknown'
-------------------------
IP | supported: 'ipv4, ipv6, ipv4v6'
-------------------------
3GPP | imei: 'XXXXXXXXXXXXXXX'
| enabled locks: 'fixed-dialing'
| operator id: '302720'
| operator name: 'Fido'
| subscription: 'unknown'
| registration: 'home'
-------------------------
SIM | path: '/org/freedesktop/ModemManager1/SIM/0'
-------------------------
Bearers | paths: '/org/freedesktop/ModemManager1/Bearer/0'
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https://bugs.launchpad.net/bugs/1579290
Title:
Sierra EM7455 not working usbutils
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