We successfully tested our 3g router with Huawei EC325 modem sold by Hutch. We did not test it yet but we believe our router will be working well with other Huawei modems like EC121 and EC220, also used by Hutch.

By the way, I was really surprised how few areas in Bangkok have EV-DO coverage. On the other hand, Hutch has CDMA pre-paid service available for tourists and people who are not living in Thailand all the time.