maverick can't use 3G

[sywangwang]

hi.when I use hw vsp3 to create com.the status of lan and vsp(Rx,Tx)is:0.So when I use QPST Software download it says port does not contain a phone in diagnostics mode.My phone now can't use 3G.though it can use wifi and call and send messeae..I'm in china.but for the reason that the chinese rom it too slow and eat battery too fast,so I flash a maverick rom. Can you tell me how can I use 3G.I can use 3G in V rom previously.thanks a lot.