Created attachment 513687 [details] messages mobile 3G network coverage isn't shown, and "connect to the 3G network" doesn't work. /var/log/messages attached. -thanks-
Created attachment 513889 [details] cut messages: only interesting lines
We'd want a bit more debug output from modem-manager. Try the following: 1) unplug your device 2) get a root terminal 3) mv /usr/sbin/modem-manager / 4) killall -TERM modem-manager 5) /modem-manager --debug 6) replug your dongle, reproduce the issue 7) paste or attach that log output from modem-manager into this bug report 8) hit Ctl+C to stop modem-manager 9) mv /modem-manager /usr/sbin/modem-manager and then we can diagnose what's going on.