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I have a Huawei EC178 3G modem. I had huawei mobile partner installed. I removed It's autostart launcher and indicator-application-service from startup applications. As a result Ubuntu have stopped detecting my modem. To fix this I tried following steps but no success.

  1. Re-entered these two applications in startup.
  2. Re-installed Huawei mobile partner.
  3. Tried what is suggested on here.
  4. Tried what is suggested here too.

Modem manager is not detecting it either. Ubuntu only detects modem as storage device. I tried to connect my modem on an other system to confirm whether this issue is with device it self, but device was connected successfully on that system.

Ouput of lsusb

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 002: ID 413c:8133 Dell Computer Corp. Wireless 5720 VZW Mobile Broadband (EVDO Rev-A) Minicard GPS Port
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 002: ID 12d1:1505 Huawei Technologies Co., Ltd. E398 LTE/UMTS/GSM Modem/Networkcard
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications Processor
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Output of usb-devices

T:  Bus=07 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  3 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=12d1 ProdID=1505 Rev=00.00
S:  Manufacturer=HUAÿWEI TECHNOLOGIES
S:  Product=HUAWEI Mobile
S:  SerialNumber=ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
C:  #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage

EDIT: It seems that my modem is being detected but not working properly. When I ran sudo wvdial console output was:

~:\> sudo wvdial
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT#777
--> Waiting for carrier.
ATDT#777

Where it hung on last line. wvdial.conf is

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = #777
Password = ptcl
Username = [email protected]
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follow the answers in this question and install the applications and see. askubuntu.com/q/380650/296776 –  Dumindu Mahawela Jun 29 at 7:36

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