I have an iPhone XR that's fully updated. I have a Spectrum modem and router. Both work great. Recently I've gotten a wifi smoker and a nest thermostat. Both require my phone to connect to a 2.4 GHz network. And then them connect to that. With the router it doesn't let me adjust settings. I know it broadcasts as 5GHz and 2.4 as needed, but it always goes to 5GHz on my phone