The app will only connect on 2.4ghz. Most phones auto connect on the 5ghz side of the wireless router. I just enabled the guest network on the 2.4ghz wireless side and connect my phone on the guest network. It works great and is very stable, at least with Android. I really like the alarm features. If there is no beeps, all is well with the pit and food is not done yet. Has alarms for each probe.