astanley
En-Route
Is this his US sim?
Is he dialing using IDD correctly?
He should just use the + code and then '1' followed by the 10 digit number when calling the US. When callin in country (France) he still needs to dial using the '+" sign and '33' followed by the French number.
The most common mistake. To call the states:
+1 617 254 1030
Always make sure you have the + key on there. You absolutely need it.
Cheers,
-Andrew