i have a cdma modem made by anyData, it connects to the internet without a simcard and i only can use it with vwdial.
in liveCD i was able to connect via kppp but after install, it fails to connect.
the network manager sees as an 3G modem but further on it says to me that it has no simcard inserted.
so, go for vwdial as i did myself! you will need dial number, user ID and password.