2.4 GHz remains common
Many inexpensive IoT devices support only 2.4 GHz because it offers broad compatibility and adequate throughput for sensors, switches and similar devices.
One SSID vs separate IoT SSID
Some routers can steer devices across bands under one network name; others provide dedicated IoT networks for compatibility or isolation. The right choice depends on device discovery requirements and the router's actual isolation behavior.
Support lifecycle matters
A smart device can remain installed for years. Prefer products that receive security updates and avoid exposing device-management interfaces directly to the public internet.
Coverage before bandwidth
A doorbell, camera or outdoor sensor at the edge of the home may need better radio placement more than a faster internet tier.
Networking capabilities vary by hardware, firmware, ISP, country and radio environment. Settings names differ among manufacturers, so use your device's current documentation for product-specific changes.