The iOS 15 download option is grey in colour not in blue why ?? I’m using good WiFi and kept phone in charge
iPhone 11, iOS 14
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See this suppport article:--> If your iPhone, iPad or iPod touch won’t update
If the issue persists, try to update it via computer:
Learn how to update your device manually if you're using a Mac with macOS Catalina or later, or if you're using a Mac with macOS Mojave or earlier or a Windows PC.
If you still get no help, contact Apple Support directly, using this link:--> Get Support
Regards
Giulio