Update the PRL (Preferred Roaming List) on your device for the Samsung Galaxy S9+
Steps to update the PRL on your Samsung Galaxy S9
Keeping your Preferred Roaming List (PRL) up-to-date can improve your network coverage.
1. From the home screen, swipe down the Status bar.
2. Tap the Settings icon.
3. Scroll to and tap System Updates.
4. Tap Update PRL.
5. The device will search for an update.
Once complete, tap OK.
6. The PRL is now updated.