After upgrading to Fedora 7, my Vodafone 3G Datacard (the old UMTS PCMCIA adapter) stopped working. Here's what I had to do to make it work again.

Create /etc/udev/rules.d/48-UMTS.rules with the following content:

BUS=="usb", KERNEL=="ttyUSB0", SYSFS{interface}=="Data Interface", SYMLINK+="umts", \
  RUN+="/usr/bin/wvdial --config /etc/wvdial-pin.conf"
BUS=="usb", KERNEL=="ttyUSB2", SYSFS{interface}=="Data Interface", SYMLINK+="gsm"

The wvdial configuration for setting the PIN is stored in /etc/wvdial-pin.conf. Replace "1234" with your own PIN.

Modem = /dev/umts
Baud = 460800
SetVolume = 0
Dial Command = ATDT
FlowControl = NOFLOW
Init1 = ATZ
Init2 = AT+CPIN="1234"

/etc/wvdial.conf contains the settings for establishing an UMTS connection:

[ModemUMTS]
Modem = /dev/umts
Baud = 460800
SetVolume = 0
Dial Command = ATDT
Init1 = ATZ
Init2 = ATM0
Init3 = ATM0
FlowControl = NOFLOW
[Dialer umts]
Username = VFD2
Password = WAP
Phone = *99***1#
Stupid Mode = 1
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = AT+CGDCONT=1,"IP","web.vodafone.de"
Inherits = ModemUMTS

Next, we need to configure a network interface. Put this into /etc/sysconfig/network-scripts/ifcfg-umts:

IPV6INIT=no
ONBOOT=no
USERCTL=yes
PEERDNS=yes
TYPE=Modem
DEVICE=ppp0
BOOTPROTO=dialup
LINESPEED=460800
MODEMPORT=/dev/umts
IDLETIMEOUT=300
PROVIDER=umts
DEFROUTE=yes
PERSIST=no
WVDIALSECT=umts
MODEMNAME=ModemUMTS
DEMAND=no
PAPNAME=VFD2
AC=off
BSDCOMP=off
VJCCOMP=off
CCP=off
PC=off
VJ=off

This configuration has to be made available at two other locations:

ln /etc/sysconfig/network-scripts/ifcfg-umts \
  /etc/sysconfig/networking/devices/ifcfg-umts
ln /etc/sysconfig/network-scripts/ifcfg-umts \
  /etc/sysconfig/networking/profiles/default/ifcfg-umts

Now, tell PPP about the connection in /etc/ppp/peers/umts:

connect "/usr/bin/wvdial --remotename umts --chat 'umts'"

In /etc/ppp/peers/chap-secrets and pap-secrets, append this line at the end:

"VFD2"  *       "WAP"

SELinux prevents udev from running wvdial, and initialization of the PIN fails. To get around this, create /tmp/udevwvdial.te:

module udevwvdial 1.0;

require {
        type var_lock_t;
        type udev_t;
        class dir { write remove_name add_name };
        class file { write read create unlink };
}

allow udev_t var_lock_t:dir { write remove_name add_name };
allow udev_t var_lock_t:file { write read create unlink };

Compile and load the SELinux module.

checkmodule -M -m -o udevwvdial.mod udevwvdial.te
semodule_package -o udevwvdial.pp -m udevwvdial.mod
semodule -i udevwvdial.pp

The semodule command stores the module in /etc/selinux, so it will stay active when you reboot.

You should now be able to establish a connection with ifup umts and terminate it with ifdown umts. When the card switches between UMTS and GPS, the connection attempt may time out, so retry before checking the configuration files.