Hi,
I have the same MC8705 and RB411UAHR combination setup.
I am using with a bell canada sim however.
I have been as of yet, unable to get operator scan or the like.
Can you tell me some information about how you configured the MC8705 module?
Are you in QMI or DirectIP mode?
Did you send any AT commands to the modem prior to initializing your connection?
(AT+BAND?, etc etc)
Best,
– Pepin