Hi! I understand that your gas heating isn't showing up on the Bryant SmartHome app on your iPhone running iOS 18.6. Let's work through this together.

First, can you tell me a bit more? For example:
- Is your thermostat currently showing as connected in the app, or is it offline?
- Are other functions of the thermostat showing normally in the app?
- Has your heating system been working physically (heating your home) even though the app doesn't show it?
- Have you recently changed Wi-Fi networks, router settings, or updated the app?

To start troubleshooting, here are some basic steps:
1. Ensure your thermostat is set to "Heat" mode physically on the device. Sometimes if it’s on "Off" or "Cool," the heating info won’t show.
2. Confirm the thermostat has power—check that the furnace breaker is on and the unit itself is running normally.
3. Verify that your thermostat is connected to your home Wi-Fi network. If the thermostat is too far from the router or on a different frequency band (like 5 GHz only, while the device supports 2.4 GHz), it may appear offline or fail to fully sync.
4. Restart your thermostat by powering it off and on again.
5. On your iPhone, close the Bryant SmartHome app fully and reopen it. Also, check if there’s an app update in the App Store.

If those steps don’t help, I may guide you on re-pairing your thermostat with the app or checking for firmware updates to the thermostat.

Could you try these and let me know what you find? If you see any error messages or unusual behavior, please share that too. We’ll get this sorted!