Hello
Do i have to delete my photos from my iphone to free space
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About storage on your device and in iCloud - Apple Support
I'm not sure if you've already checked this and you know for sure that Photos are what's taking up all your space?
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
So if Photos is the big space killer for you, you can use iCloud Photos to free up space on your device by using the Optimize Storage option..
Set up and use iCloud Photos - Apple Support
Buy more iCloud storage - Apple Support
OR you could just transfer them to a computer and remove them from your phone..
Transfer photos and videos from your iPhone, iPad, or iPod touch - Apple Support
OR yes, you could simply delete them
if you are experiencing an issue that has been seen a lot lately, where 'other' is taking up a bunch of your space.. try updating to the latest iOS 13.6.1