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It took a little play, but I finally managed to tether and operate my sph-i700 successfully as a CDMA modem through linux.
No more XP and “special drivers” necessary!
My distribution is Slackware 9, phone s/w windows mobile 2003.
I’m using a third party minisync cable from boxwave. Here is the process that worked for me, Using information gleaned from a number of different informative sites:
Power up and connect your i700 via the sync cable.
There are three types of USB controllers usually found in computers, the uhci, the ohci and the ehci. They have the corresponding kernel modules, uhci.o, ohci.o and ehci-hid.o. Load the correct module for your system. eg for uhci, type (as root)
modprobe uhci
( Mine happened to be active by default in the distro )
The i700 conforms to the Universal Serial Bus Communication Device Class Abstract Control Model (USB CDC ACM) specification, So activate acm.o with:
modprobe acm
Note that for the i700 you do NOT need to modprobe usbserial
or ftdi_sio.
/var/log/messages should now contain the following:
hub.c: new USB device 00:07.2-1, assigned address 2
usb.c: USB device 2 (vend/prod 0x4e8/0x6601) is not claimed by any active driver
usb.c: registered new driver acm
ttyACM0: USB ACM device
acm.c: v0.21:USB Abstract Control Model driver for USB modems and ISDN adapters
Don’t let the “not claimed by any active driver” throw you… keep moving on.
Next – You’ll notice that the i700 was established by acm as ttyACM0. Great!
However, take a look under /dev filesystem and ttyACM0 is nowhere to be found.
What to do?
"Make node" will create a device entry that does not already exist. Make sure to run it as root
mknod ttyACM0 c 166 0
Make sure you have read and write permissions globally
chmod go+w /dev/ttyACM0
(go+w = add write permissions to group members and other/everybody)
Now, symlink your new virtual device to modem ( optional )
cd /dev/
ln –s /dev/ttyACM0 /dev/modem
At this point, it was easiest for me to create the necessary ppd files with the pre-existing “helper” script included with slackware
pppsetup
I chose:
atdt#777 as the phone number of ISP
/dev/modem as /dev/ttyS
230400 as baud rate
( this speed worked for me, but you may want to trying starting out with 115200 )
No callback
Default init string
Vzw3g.com as ISP domain name
Nameserver as 66.174.6.7
Secondary as 66.174.3.7
(it's prob. better to add usepeerdns to the options file manually tho )
PAP Authentication
yourcellnumber@vzw3g.com
password vzw
Now, go to /etc/ppp and edit your options file.
It should read like this:
lock
defaultroute
noipdefault
usepeerdns (add this line manually)
modem
/dev/modem
230400
crtscts
noauth (uncomment this )
passive
asyncmap 0
name yourphonenumber@vzw3g.com
Now, you should be able to issue command
ppp-on
That’s it! If all goes well, you should see the connection link up with something like
Serial connection established.
Using interface ppp0
Connect: ppp0 <--> /dev/modem
Local IP address 69.78.XXX.XXX
Remote IP address 66.174.216.13
Primary DNS address 66.174.6.7
Secondary DNS address 66.174.3.7
Local: 69.78.XXX.XXX -> Remote: 66.174.216.13 ppp0
Press enter and test things out with a ping to your favorite IP.
Disconnect the link at any time with the command
ppp-off
As far as I’m aware, operating the i700 as a tethered modem under any operating system is officially unsupported by Verizon. Also, according to the manual, use of any 3rd party hardware instantly violates your warranty. So – use this proceedure at your own risk. I haven’t had any issues with these steps, but your mileage may of course, vary.
Good luck, and happy networking! ( Look ma – no wires! )
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