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Good question. I have called him in the US using BOTH methods. If I manually enter the 10-digit number, my phone will automatically add the international prefix. I have also called using the international prefix, plus the country code. Both methods work.
His phone appears to be working correctly in the US as there are no issues with making calls, but texting to me on the Verizon network seems to be an issue. We'll call AT&T to see if they have any answers. (Although I bet they say it's Verizon's fault and vice versa 
)
Anything else I can check on my end?