I've been using this app as default for years. It worked fine yesterday morning, then in the afternoon it put a Mexico prefix in front of my wife's number which meant she could not receive any of my txt messages anymore. This also meant i could not call her with the call feature through the app. I even uninstalled my wife's contact from my contacts and made a new contact for her making sure to not have a Mexico (+52) prefix in front of her number. It didn't work. I now use Samsung txt. It works