You moved into a place with an existing home security system
Sometimes when you purchase a home, a modern security system is already established. All the alarms and cameras work, are placed in the right spaces, and are ready to go. In this case, you might find that you have to call and establish a new service contract. A Vivint installer will still come to your home to ensure there are no compatibility issues, and they might offer options on an upgrade or two. It's a preliminary trip, and you can have your monitoring set up without paying for any new devices -- unless you get some new devices.
The outgoing owners can transfer an existing Vivint contract to you for a one-time transfer fee to make the transfer a snap. If the outgoing residents downsize to an apartment or retirement community, you keeping the security contract might be a condition of the sale.
You need to move and bring your old equipment with you
You might need to bring your existing home security components with you to a new house when you move. That’s fairly simple to transfer, as many alarms and smart devices are wireless. You can uninstall each alarm or camera by yourself or contact a professional installer to take care of your devices. Then an expert will put in the same components -- and any additions you want to have -- in the new home. The home security contract will keep the same.