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Find out what /dev/cuaU maps to?

I have an USB 3G modem (Huawei E353-u2) on pfSense 2.0.2 (which is based on FreeBSD 8.1-RELEASE-p13), it seems to create 2 /dev/cuaU devices: /dev/cuaU0.0 /dev/cuaU0.3 1) Why are there 2 devices? ...