Add another device for spouse

When adding my wife’s phone as a device, do we use the main log in on her phone also when she downloads the app or does she create another log in?

Hi! 

Yes, you can surely add your wife's mobile device by using your main login. Just download the app and choose "sign-in using your Trend Micro Account". 

If You Want to Share the Same Account (Same Data, History, Settings): ➡ Use the main login (your account) on her phone. This is common for apps like: Home security systems (e.g., Ring, Arlo, Nest) Streaming services (Netflix, Spotify) Smart home apps (Google Home, Alexa) Location-sharing or family apps (Life360, Find My, etc.) Drift Boss