hi normis,
How do u add a 3g usb modem on a rb433 uah?
and once added can you just setup a normal ppp dial out? and use it as fail over if dsl line goes down?
this is not my personal forum, you know 
there are lots of others here
this is what you do after connecting a USB 3G device, make a new PPP connection:
http://wiki.mikrotik.com/wiki/Option_Globetrotter_HSDPA_USB_Modem
sorry, Iknow it is not your’re personal forum but your the best LOL
I connected the 3g modem, in the system resources usb it picks it up, but it does not pick it up in the ports.
I was on 3.27 and downgraded to 3.23, tought it could be a version problem but still the same issue.
please make the support output file when the modem is plugged in and send that to support@mikrotik.com
Also specify the modem name.