I am using Ubuntu 12.04. I use my LG cellphone titled GU220 using Aircel connection. The phone gets connected as an USB device well enough, but the network always fails to connect whenever I try to connect through mobile broadband. I also have Windows 7 which does not fail to connect the network through PC Suite.
I tried it several times even after restarting both phone and Ubuntu but in vain.
Also for 1st two days things worked well and the network was well connected; the problem started just after those two days - in from the next login.