The only thing I can think of, is perhaps US Cellular just isn't for some reason recognizing the 4G devices on their network as authenticated for calling. Though it didn't explain why my data roaming worked. The tech when I called was stumped too. They did say that whenever it happened, to call in to customer service as soon as I could to report it, but that doesn't really help. My guess is that it's more on the US Cellular end in regards to how it handles VZWs 4G devices, but really, that would be something that USC and VZW would really need to get together and hash out, and...I think the odds of that are slim...
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Samsung Galaxy Nexus LTE - JBSourcery V5.3
Asus Nexus 7 Tablet - Stock Retired: Motorola Droid 3, HTC Thunderbolt, Samsung Fascinate, Samsung Omnia
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