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Invalid mobile number
I downloaded Google Voice application from Google Store to my Android smartphone. When registering, it asked my phone number. So I entered the US phone number assigned to my SIM card by Freedompop. But I got an error message indicating that the entered mobile number was invalid. I tried another Google Store application. When it asked for my phone number, it showed the default country as "United Kingdom" and I could not change it to "United States". I noticed that my SIM card showed "3 UK". Were the problems caused by the SIM card because it was issued by a UK operator?