My phone dont worked wifi.i want ios 15 download. Please help me

Then try updating it with a computer.

Update using your computer -

https://support.apple.com/guide/iphone/update-ios-iph3e504502/ios

Eskeragayev Said:

"My phone dont worked wifi.i want ios 15 download. Please help me: Wifi dont worked. I want download ios15. Help me"

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Have Ethernet?:

If your WiFi is down, then try Ethernet. Read the following...

To Check for Updates:

Use a Computer and Ethernet:

Start with attempting an update through use of a computer. If you cannot use Wi-Fi, then use Ethernet.  Go Here: Update your iPhone Using a Computer - User Tip. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple. If you get the same error, the model is likely just not compatible.