Thanks for reaching out and congratulations on your new Samsung J3! A new device can be very exciting, I can understand wanting to make sure all your settings are set up correctly. To determine the cause of this rebooting issue that you are having, it is best to complete all troubleshooting steps. The first thing we need to do is restart your device in Safe Mode. Here are some instructions on how: http://spr.ly/6582D7i08. Please let me know once you complete these steps.