Thank you everybody who contributed! I appreciate all your help!
I noticed that I did not have any USB listed in /dev.
So I installed kmod-usb-uhci, kmod-usb-ohci and kmod-usb2.
Now I see ttyUSB0, 1 and 2 under /dev (cd /dev then ls).
I also noticed that cat /sys/kernel/debug/usb/devices lists the USB modem (ZTE Mobley).
T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=19d2 ProdID=0117 Rev=50.33
S: Manufacturer=ZTE,Incorporated
S: Product=ZTE Technologies MSM
S: SerialNumber=(removed)
C:* #Ifs= 3 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E: Ad=83(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E: Ad=85(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I also installed usbutils, and lsusb gives me the following:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 19d2:0117 ZTE WCDMA Technologies MSM
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Just a note: the modem is plugged in the "USB 1" port, not "USB 2" (label in the router). Shouldn't it list in Bus 001, or Bus 002 Device 001? Just out of curiosity.
Using lsusb -t, I get:
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 2, If 1, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 2, If 2, Class=Vendor Specific Class, Driver=option, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M
dmesg gives the following:
[ 14.427664] usbcore: registered new interface driver option
[ 14.433558] usbserial: USB Serial support registered for GSM modem (1-port)
[ 14.441151] option 2-1:1.0: GSM modem (1-port) converter detected
[ 14.447715] usb 2-1: GSM modem (1-port) converter now attached to ttyUSB0
[ 14.454989] option 2-1:1.1: GSM modem (1-port) converter detected
[ 14.461507] usb 2-1: GSM modem (1-port) converter now attached to ttyUSB1
[ 14.468785] option 2-1:1.2: GSM modem (1-port) converter detected
[ 14.475341] usb 2-1: GSM modem (1-port) converter now attached to ttyUSB2
I also installed comgt.
Now I think I need to create the interface pointing to this USB device, correct? I just don't know if it's "usb0", "usb1". Sorry, not really a linux user.
UPDATE:
I configured wan interface (file /etc/config/network using vi editor) to:
config interface 'wan'
#option ifname 'eth0.2'
#option proto 'dhcp'
option proto '3g'
option device /dev/ttyUSB2
option service umts
option apn broadband
option delay 30
I also installed package luci-proto-3g so I can configure it via LuCI interface.
I see that wan interface is connected and there is tx and rx active, so looks like the modem is successfully connected.
In my computer (connected via ethernet cable) I have connection, but wireless (2.4 and 5 Ghz) there is no internet.
UPDATE:
I rebooted and I seem to have Internet now, wired and wireless.
I just would like help to know how separate things are. I understand that the connection between the router and USB modem (interface wan?) should be separate from the wired and wireless connections to the router (interface lan?). What about the IPs? The USB modem assigns a IP to the router (acting as a client), correct? The router assigns IPs to wired and wireless clients. Are these IP in the subnet? Is it possible for me to put them in the same subnet so I can access my USB modem admin page (192.168.1.1) from my computer?
Also, the LEDs for USBs are off. Is it possible to configure OpenWRT to use the leds to show the TX/RX of the USB Modem? That would be cool so I can see the activity of the usb modem.
Thanks again!