Have you asked T-Mobile for the connection info that will allow you to set up your modem for use on a LINUX PC?
Such info as;
Username = ? (mine = three)
Password = ? (mine = three)
Any Init strings? (Mine On three are below )
Init2= ATZ
Init3 = ATE0 V1 &D2 &C1 S0=0 +IFC=2,2
Init4 = AT+CGDCONT=1,"IP","three.co.uk"
Phone No = ? (*99# for three)
I need the above info to help you set up your 3G settings on your Q7, we may be able to use some of what is quoted here
http://www.filesaveas.com/gprs.html if T-Mobile wont help.