Had a SPH-M840 Galaxy Ring Virgin Mobile 3G Android version 4.1.2, attempting to install apps from Android Studio failed to detect device.
Installed SAMSUNG_USB_Driver_for_Mobile_Phones.exe (see https://androidforums.com/threads/usb-drivers.537433/ for link)
and also Kies3Setup.exe (install Kies) when the first didn't work, i.e. wasn't found when trying to update driver via Windows 7 Device Manager per https://developer.android.com/studio/run/oem-usb.html#Drivers. Kies failed to detect it either.
Sometime after however, SAMSUNG Android Phone and SAMSUNG Android ADB Interface appeared in the Device Manager, and I was able to run app and install apk on the phone.