G7 river wont find network. 2 phones same problem

So I have the latest build installed on 2 phones. both new G7 rivers. got the correct DL for them. installed and everything seemed great. got 2 new sims from US Mobile. spent 2 hr on the line with tech support and could not get either phone to recognize any network. Wifi ok, everythink else appears fine. when I go to te network APN everything is greyed out. cant add an additional APN. at a loss as to what to look for… :-/

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