How to activate cellular XBee 3G if SIM not supplied by Digi?

I have a XBee Cellular 3G (XBC-M5-UT-001) with default configuration settings for which I purchased a BELL SIM card (Data plan activated). I can see in Configuration working mode that I have cellular signal strength (DB = 61) but Association Indication keeps changing between 22, 23, and FF upon successive configuration reads, the end result is no cell network association.

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You need to set the APN (AN command). Talk to your carrier and they can provide you the value for it.