Hello, I will be moving to Lisbon in the next couple of months and looking to keep my US phone number. I tried to use google voice but when I type in my number, it says the number is not available. Am I doing this wrong? Is there a better way to keep my US number? I was told by T mobile(my current service provider) that once I am out of the country for a certain period of time, they will shut down my service. Any help would be greatly appreciated!