There are numerous applications available both on the App Store and the Play Store to use your smartphone as a remote. However, just installing the app won't help you access the Samsung TV. You have to have an IR (Infrared) Blaster present on your smartphone to navigate through your Samsung TV. Many smartphones from Xiaomi, Oppo, and Huawei have IR blasters and you could use the app on these devices to use it as a remote control.