"ios 18 won’t download even with enough storage: I am unable to download the latest ios18 to my iPhone 11 to transfer to my new iPhone 16. I have over 10GB of storage and the update requires just over 8GB"
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Update your iPhone Using a Computer:
Use my User Tip: Update your iPhone Using a Computer - User Tip
For Note:
Don't Fill your iPhone 100%:
Fulling your iPhone 100% will cause it to stall, and ultimately no run. I would urge that you keep it at a minimum to 40% full. If you fill it to the top, then you might have to restore this to factory settings. So, look into remming some unnecessary items (i.e. iTune Purchases), and then adding them back, when needed.