Is it possible to install and use a phone monitoring app on a device that doesn’t have an active SIM card, like an old phone I’m just using as a dedicated tracker, or do these apps require a cellular connection to function properly?
You don’t necessarily need a SIM card for a monitoring app to work, but it does require a stable internet connection. If your old phone has Wi-Fi, you can use it to monitor location and some activities. I’d recommend checking out mSpy as it’s a reliable solution for phone monitoring and can work with just a Wi-Fi connection.