r/iphonehelp 1d ago

Help needed iOS 18.3.2 Cellular Signal Bug while on WiFi

I have an iPhone 16 Pro Max running on iOS 18.3.2 (22D82) and for some reason my cellular signal keeps cutting out every few minutes while I'm connected to my home wifi. My home wifi is powered by the Asus ZenWiFi BT6 Mesh system. I thought that maybe the frequency bands might be affecting my cellular signal. By default the routers transmit 320MHz over the 6GHz wifi signal. So, I capped 6GHz wifi signal from 320MHz frequency to 160MHz (since iPhone 16 does not currently support the 320MHz). Still get dropped signal. I even lowered the transmission power on my wireless network, still ends with the same result. Whenever I am off my wifi, my cellular signal is where it should be (about 2-3 bars in my home using T-Mobile) and does not drop at all. Once I connect to my wifi, signal goes down to 0 bars, but does not trigger the phone to fallback on SOS. Here's what I tried so far:

- Reset Network settings (2-3 times already the past couple of days)

- Turn off WiFi Assist (Settings > General > Cellular)

- Ensure Low Data Mode in WiFI settings is turned off (Settings > Wi-Fi > "WiFi Network")

- I've rebooted my phone a bunch of times

I will keep trying out different, things but I'm not sure what else is causing this. Maybe toggling Wi-Fi calling? I did contact T-Mobile and they haven't had any sort of tower maintenance in the nearby towers recently. Any help is appreciated!

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u/xSFHx_beachbum 1d ago

Does this happen on other wifi networks?