If you want to use umtsmon on openSUSE, it will fail to set the DNS entries. The reason is that with
netconfig refuses to update the
resolv.conf as it thinks only NetworkManager should do so.
You usually don’t want to disable NetworkManager in sysconfig, as that would disable NetworkManager (so you can’t configure WLAN/LAN).
So you will have to set up a custom NETCONFIG_DNS_POLICY in /etc/sysconfig/network/config to tell netconfig that you want both ppp and NetworkManager to control the DNS configuration:
NETCONFIG_DNS_POLICY="STATIC_FALLBACK ppp* NetworkManager"
netconfig(8) for more information.