Welcome to Rogers Community, and congratulations on your new phone!
Your phone model, is it A03 or A53? AG3 may not be a Samsung phone. The beeping could be related to app notifications. If you were to swipe down from the top, you should see the app trying to notify you. You can go to Settings >> Notifications to manage the notifications.
If it’s challenging to figure out why the phone is beeping, you can book an appointment at a nearby Rogers Store. An in-store tech can be of help.
Community - anybody has experienced a phone beeping every 15 minutes as reported in this post?