Do you have residential or business service?
For business service, it is likely that you have a static IP address, which cannot be easily changed. If you have dynamic IP address, simply go to the router and Release the DHCP or just unplug the WAN and plug it back in.
Do you have Verizon wireless service? Wireless is typically always an IPv6 dynamic address. Your wireless address changes every time you turn on or off the cellular data.