how can I switch on my modem at network manager, I have prolink PHS100 GSM 3G modem which works well on Ubuntu 12.04 but when plugged in to my laptop which use Ubuntu 13.04 it doesn't work with same setting in Ubuntu 12.04. After I click on the modem said "You now connected to GSM network" but there is no internet connection. Then I go to network manager, on Mobile Broadband option I can't switch to on, it always switch back to off mode.
info: my laptop is Acer aspire s3-951
Please help, thanks