Activating Gateway Where There's no Cellular Signal
My daughter just signed up for internet, TV, and voice. She will be renting a Comcast gateway with voice. She has AT&T cellular.
She'll be moving to an area where there is Comcast, but cellular service is iffy to non-existent. The instructions on how to activate her Comcast gateway say to download the app from the app store. Can she download it when she is in my area where cellular signal is fine, and then use the app at her new location? That is, what does the app communicate with, the gateway, or is it needed to communicate with Comcast, which it won't be able to do since there's no cellular signal where she is setting up the gateway.
What does she do?