I too am using the MC8705, but on Telecom XT here in NZ.
But I do not have to put in any init commands to get it working, just using channel 3.
BUT: I am having one big problem. After a random amount of time, ie 1 week or 4 weeks, the 411 board looses connectivity with the modem and it requires a manual hard power down and then power up. This is difficult as the router is located at a remote site that doesn't see many people. The log says something along the lines of error connecting to usb modem.
I have set the router to do a soft reboot at 3am every night, and this had limited the problem to make it less frequent but it still occurs.
As of 3 days ago, my modem is offline, and I can't get someone there until the end of this month. Signal strength is normally around -82dBi? using a 5dBi external antenna, and get great speeds. I am also using the hotspot function, which I might stop because it seems to act weird when trying to connect a client and there is no 3G connectivity. It would be great if a landing page came up with a button which says 'press to try and reconnect as the 3G is down'.
I am using 5.5, but this has been happening since in the early 5's version. Can anyone help?