Ｅｖｅｒｕｎのモデムで3GWatcher（専用ソフト）を使わない設定方法

FAQにありました

Initialization Command
1. In Device Manager, under Modems, select Sierra Wireless MC8775 HSDPA Modem and click Properties.
2. On the Advanced tab, type extra initialization commands as follows:
at+cgdcont=1,"IP","apn"
where, apn is your APN (e.g. for Cingular, you would type in at+cgdcont=1,"IP","ISP.CINGULAR")

いわゆるいつものおまじないでした。