Finding a WIFI to update my iphone is difficult at best. I use my iphone's personal hot spot for internet connectivity. Been searching for years how to update my phone without wifi or iTunes. Found it yesterday. Here's how:
Go to Settings>General>Date & Time - turn off Set Automatically. Set date at least 6 months ahead
Go to Settings>General>Software update - Check for updates. Download now. OK to use cellular data,
After down load completes. Go to Settings>General>Date & Time - turn on Set Automatically
Go to Settings>General>Software update - update now
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