You moved into a place with a pre-existing home security system
Sometimes when you close on a home, a modern security system is already in use. All the components function well, are hung in the right areas, and are ready to go. In this case, you might discover that you have to call and set up a new monitoring contract. A Vivint professional will still come out to make sure there are no usability issues, and they might offer options on an upgrade or two. It's a preliminary visit, and you can get your monitoring set up without having a bill for any new alarms and cameras -- unless you get some new devices.
The old homeowners can transfer an existing Vivint contract to your family for a nominal transfer fee to make the transfer simpler. If the owners are moving to an apartment or retirement community, turning over the Vivint contract might be a part of the sale.
You want to move and bring your home security equipment with you
You might need to bring your favorite Vivint system with you to your new house when you move. Luckily, it's pretty easy to accomplish, as most components are plug and play. You can remove each device yourself or contact a Vivint expert to come and dismantle everything. Then an expert will set up the same components -- and any additions you want to have -- in your new home. Your home security contract will remain the same.