I think that this is an issue that should be fixed. Neither kppp nor
wvdial are usable by default.

I use default Ubuntu 9.04 beta installation. I tried to set up GSM/EDGE
connection with NetworkManager, but it didn't connect displaying no
error messages.

Then I installed kppp and launched it from console. It didn't connect too. The 
output to console was the following
kppp(13887) Modem::opentty: Opening Device:  "/dev/ttyACM0"
Opener: received OpenDevice                                
Opener: received ExecPPPDaemon                             
Kernel supports ppp alright.                               
received unexpected SIGCHLD.                               
In parent: pppd pid 13911                                  
Opener: received OpenResolv                                
error opening resolv.conf!                                 
Couldn't find interface ppp0: No such device               
Couldn't find interface ppp0: No such device               

Then I installed wvdial. It didn't connect too, but fortunately it wrote about 
the cause
--> PPP negotiation detected.
--> Unable to run /usr/sbin/pppd.
--> Check permissions, or specify a "PPPD Path" option in wvdial.conf.

Then finally I found out that a user should be in dip group to be able
to launch pppd. After adding the user to that group both kppp and wvdial
started connecting.

** Changed in: ppp (Ubuntu)
       Status: Invalid => New

-- 
/usr/bin/pppd has group owner dip, not dialout
https://bugs.launchpad.net/bugs/292203
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