I have an older phone that has starting telling me I am roaming while trying to make a call recently. As soon as it starts trying to ring, there is an automated message that tells me I am roaming and that I need to contact my carrier to purchase something with a pin. It mostly happens while I am at work, which is literally 1 mile from my house. When I get home, it works just fine. I live in Wisconsin. I have a Galaxy S7. I would really like my phone to continue to work. What is going on? This just started withing the last two weeks. Prior to that, I was able to make calls from the office or near the front door at work. The main part of the building doesn't allow my phone to work since it is a steel building.