Huawei ME906s does not connect

[Philipp Hagemeister]

My Huawei ME906s in a Lenovo T460p failed to connect on debian unstable,
Fedora 24, as well as Windows 10. How can I find out what's wrong? I
have verified that the (German T-Mobile) SIM card is PIN-free and works
in an Android phone.

I see a network device on debian and Fedora, but it shows up as NO-CARRIER:

$ ip link
...
6: enp0s20f0u5c2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc
pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 02:1e:10:1f:00:00 brd ff:ff:ff:ff:ff:ff

Unsurprisingly, dhclient fails when manually invoked. Since
NetworkManager did not give me any error message (it just shows the
network as perpetually connecting), I went ahead and killed ModemManager.

Talking via wvdial to the device looks like this:

-> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: AT+CFUN=1
AT+CFUN=1
OK
--> Sending: ATQ0 V1 E1 S0=0
ATQ0 V1 E1 S0=0
OK
--> Sending: AT+CGDCONT=1,"IP","internet.t-mobile"
AT+CGDCONT=1,"IP","internet.t-mobile"
OK
--> Modem initialized.
--> Sending: ATD*99#
--> Waiting for carrier.
ATD*99#
NO CARRIER
--> No Carrier!  Trying again.
This repeats again and again.

I am currently using modem-manager 1.4.14-1 from debian unstable on
Linux 4.7.0-rc4-amd64 (tried with various other versions too). You can
see a bunch more information at http://superuser.com/q/1079052/62132 ,
but I am happy to provide any further logs that may help.

How can I find out what's wrong here?

Best,

Philipp
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$ nmcli c show 2ebee9ae-6ed0-4e52-92f9-a4c987a3fcf5
connection.id:                          mobilcom debitel connection 1
connection.uuid:                        2ebee9ae-6ed0-4e52-92f9-a4c987a3fcf5
connection.interface-name:              --
connection.type:                        gsm
connection.autoconnect:                 yes
connection.autoconnect-priority:        0
connection.timestamp:                   0
connection.read-only:                   no
connection.permissions:                 
connection.zone:                        --
connection.master:                      --
connection.slave-type:                  --
connection.autoconnect-slaves:          -1 (default)
connection.secondaries:                 
connection.gateway-ping-timeout:        0
connection.metered:                     unknown
connection.lldp:                        -1 (default)
ipv4.method:                            auto
ipv4.dns:                               
ipv4.dns-search:                        
ipv4.dns-options:                       (default)
ipv4.addresses:                         
ipv4.gateway:                           --
ipv4.routes:                            
ipv4.route-metric:                      -1
ipv4.ignore-auto-routes:                no
ipv4.ignore-auto-dns:                   no
ipv4.dhcp-client-id:                    --
ipv4.dhcp-timeout:                      0
ipv4.dhcp-send-hostname:                yes
ipv4.dhcp-hostname:                     --
ipv4.dhcp-fqdn:                         --
ipv4.never-default:                     no
ipv4.may-fail:                          yes
ipv4.dad-timeout:                       -1 (default)
ipv6.method:                            auto
ipv6.dns:                               
ipv6.dns-search:                        
ipv6.dns-options:                       (default)
ipv6.addresses:                         
ipv6.gateway:                           --
ipv6.routes:                            
ipv6.route-metric:                      -1
ipv6.ignore-auto-routes:                no
ipv6.ignore-auto-dns:                   no
ipv6.never-default:                     no
ipv6.may-fail:                          yes
ipv6.ip6-privacy:                       0 (disabled)
ipv6.addr-gen-mode:                     stable-privacy
ipv6.dhcp-send-hostname:                yes
ipv6.dhcp-hostname:                     --
gsm.number:                             *99#
gsm.username:                           t-mobile
gsm.password:                           <hidden>
gsm.password-flags:                     1 (agent-owned)
gsm.apn:                                internet.t-mobile
gsm.network-id:                         --
gsm.pin:                                <hidden>
gsm.pin-flags:                          0 (none)
gsm.home-only:                          no
gsm.device-id:                          --
gsm.sim-id:                             --
gsm.sim-operator-id:                    --
GENERAL.NAME:                           mobilcom debitel connection 1
GENERAL.UUID:                           2ebee9ae-6ed0-4e52-92f9-a4c987a3fcf5
GENERAL.DEVICES:                        ttyUSB0
GENERAL.STATE:                          activating
GENERAL.DEFAULT:                        no
GENERAL.DEFAULT6:                       no
GENERAL.VPN:                            no
GENERAL.ZONE:                           --
GENERAL.DBUS-PATH:                      /org/freedesktop/NetworkManager/ActiveConnection/51
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/Settings/3
GENERAL.SPEC-OBJECT:                    /
GENERAL.MASTER-PATH:                    --

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