Why can’t I back up my phone
Why won’t my phone backup
Why won’t my phone backup
Have you followed these instructions?
How to back up your iPhone, iPad, and iPod touch - Apple Support
Have you followed these instructions?
How to back up your iPhone, iPad, and iPod touch - Apple Support
Go to Settings - General - iPhone Storage [What does the amount say AND is "Others" take up too much space?]
Go to Settings - Profile (Your name at the top) - iCloud [How much storage do you have?]
Why can’t I back up my phone