Why is my iPhone not backing up when I have enough storage
My iPhone isn’t backing up and I have enough storage. Next backup says 0
iPhone 13 Pro Max, iOS 15
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The iPhone 13 Pro max storage 128 GB or 256 GB or 512 GB or 1 TB
iCloud storage with subscription -> 50 GB, or 200 GB or 2 TB.
Check -> Go to -> Settings -> your name -> iCloud -> if you see 50 GB (or 200 GB or 2 TB) then you have an iCloud subscription.
If you have an iCloud subscription, you will receive a monthly bill from Apple, check your email box.
If you have upgraded iCloud storage, it would take about 1 to 3 business days in order to process.
Once your request for iCloud+ has been activated, you should receive an invoice in your email box.
If you turn on iCloud, you get 5 GB free iCloud storage.
Do you need more, see this Apple article: Upgrade to iCloud+
Upgrade to iCloud+ - Apple Support
See also: iCloud+ plans and pricing
iCloud+ plans and pricing - Apple Support
You can also make a back to your computer, than you need to free up space.
Read again -> Related Article -> If you can't back up to iCloud