I am using Ubuntu 14.04 LTS and when I connect the Linktop U100(CDMA2000 1X USB modem) the "New Mobile broadband connection" alongwith "Enable mobile broadband" appears in network drop-down menu but when I click "New mobile broadband connection" it just gets ticked with check mark but nothing prompts and there is no Internet.This same modem used to work in ubuntu 10 (exact version I do not remember). Here are the pics that show the said behavior.
Before connecting the modem:
After connecting the modem and clicking it:
I did some attempts of using wvdial,gnome-ppp but all failed.Wvdial says modem not responding after re-sending ATZ.