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Update ISO using cellular data

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