Patrick is a rideshare driver, and he uses Number Sync to connect his iPad to his mobile phone. It's from AT&T. Do other carriers do it? Leo says that it's exclusive to AT&T. TMobile does have its own called "Digits." So check that out. Either way, it allows you to make and receive calls on any compatible device. But it isn't perfect. But for rideshare drivers, it's ideal because you're not looking at a map on a tiny screen; you're able to use it through your tablet. But it works best with an iPhone and iPad.