iOS 18.4 update disabled WiFi function on iPhone 10

Rick9948 wrote: "After updating to iOS 18.4 the WiFi function on my iPhone 10 was disabled..."

Rick ~ Your iPhone is several years old and the long process of applying an iOS update to an iPhone with a weak, aging battery can be the proverbial "straw that broke the camel's back." One function that a weak battery can 'break' is Wi-Fi, so...

Does your iPhone still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Rick9948 wrote:

After updating to iOS 18.4 the WiFi function on my iPhone 10 was disabled. Verizon said it is permanently turned off and I need a new phone. Not buying it! I turned the phone off for five minutes and turned it back on, but it did help. Went to the WLAN setting on the Control Board, but it took me back to the WiFi page, the WiFi turn on/off button was still grayed out. Suggestions? I’m at a loss at this point. Think as, Rick

Reset network settings.

Just FYI, an iPhone X can't be updated beyond iOS 16.7.11. You have an iPhone XR or higher.