How to get HUAWEI ec1260 to work?

I have this EVDO modem. Now it works well by using wvdial,but I can’t make NetworkManager to recognize it correctly.When I plug in the modem, NetworkManager tells me “Auto GSM connection” which should be a “audo CDMA connection”.
how to fix it?
Please!

I’ve also found that KNetworkManager does not work as well as I would like it to, so I think it’s best to avoid it if you have another solution that works.