Ubuntu
mobile-broadband-provider-info package

  1. Bug #282207
  2. Comment #5

Comment 5 for bug 282207

Revision history for this message
Li Hu (xsd12) wrote : Re: NM 0.7 does not set APN for AT&T 3G connection

I made an interesting observation here. Aircard creates three USB serial ports when its driver gets loaded by the kernel.

/dev/ttyUSB1 does not work with any of the AT commands at all (returns nothing)

/dev/ttyUSB2 seems to work fully and gives the following output:
AT
OK
AT+CGDCONT?
+CGDCONT: 1,"IP","ISP.CINGULAR","",0,0
+CGDCONT: 16,"IP","isp.cingular","",0,0

OK
AT+CGDCONT=?
+CGDCONT: (1-16),"IP",,,(0,1),(0,1)
+CGDCONT: (1-16),"PPP",,,(0,1),(0,1)

it is possible to directly dial without (re)setting the AP
ATD*99#
CONNECT

/dev/ttyUSB0 partially works:
(local echo needs to be activated)
AT
OK
AT+CGDCONT?
ERROR

AT+CGDCONT=?
ERROR

however, its possible to set the AP manually and dial
AT+CGDCONT=1,"IP","ISP.CINGULAR"
OK

ATD*99#
CONNECT

Network Manager seems to use /dev/ttyUSB0 by default which could be a reasons things do not work.