Hello, Maryaw102870, I'm very sorry to hear that you're running into an issue with dropped calls and this is causing you to look into switching providers. We know how important it is to be able to have reliable service and are here to help with your concern. You mentioned this happened after an upgrade. What model phone did you purchase? Are you experiencing any issues with text or data? Is the calling issue happening when you are at a particular location?
-Lauren