You’re relocating to a home with home security alarms
A new house may come with an installed security system. All the alarms and cameras work, are hung in the best spaces, and are ready to go. In this instance, just get the phone to call and establish a new service contract. A Vivint professional will still show up to make sure there are no integration problems, and they could offer suggestions on an upgrade or two. It's a preliminary visit, and you can get your alarm monitoring set up without paying for any new components -- unless you add on.
The previous owners can move an existing Vivint contract to your family for a small set-up cost to make your life easier. If the previous owners are downsizing to an apartment complex or smaller home, you keeping the home security contract may be an addendum of the sale.
You are looking to move and bring your old components with you
You may want to bring along your existing home security components with you to a new place when you move. That’s fairly simple to accomplish, as many alarms and smart devices are portable. You can remove each component by yourself or use a professional installer to come and dismantle the system. Then an expert will set up the same features -- and any smart devices you need to add -- in the new house. The home security contract will keep the same.