You’ll need the latest Alexa app, which is available for iOS 9 and later.

The app also supports Drop In. This is a feature primarily intended for those who have multiple Echo devices around the home, and you can quickly send a message without the other person needing to answer – effectively an intercom system. If you have Echo Show or Echo Spot devices, then you’ll also be able to view video from those.

But you can also enable remote Drop In for specified contacts. For example, if you want the grandparents to be able to see the kids in the nursery on demand.