The official Samsung phone call app
Samsung Phone is the official app for making phone calls from a Samsung device. As with all apps of this kind, you can easily substitute it with one of the many alternatives to be found on Android, but this is the app that comes installed by default.
Thanks to Samsung Phone you can receive phone calls and see which number is calling you. If the number in question is saved in your address book you can view the name of the contact as well as the photo assigned to it. Obviously you can also make calls yourself, either by tapping one of your contacts or by directly dialing the number.
Samsung Phone is an app that comes installed by default on practically all Samsung smartphones and that, in fact, you need for making phone calls. The only way you can live without it is by installing an alternative. And luckily on Android you can find dozens of interesting alternatives.