All players must be at least 21 years-old to bet, or even to receive an account with a legal online casino in New Jersey. Legality is usually established by providing the last four digits of your Social Security number. This is used only to confirm your identity.
VPNs are Virtual Private Networks. They allow you to set up an IP address in a place where you are not physically located. You might be wondering, "Can I set up a VPN in New Jersey and play from another state?"
The answer is, yes...if you want to get barred from the casino for life. While casinos might not be able to trace a VPN back to your physical address, they are able to tell when you're using a VPN. Casinos will be fined heavily if they allow someone to place bets while they're not in the state, so they do not take kindly to a false representation of your location.
You may be barred from a legal online casino if caught using a VPN. But you can play from a smartphone, tablet, or computer from anywhere in the state.