hi , i lost my phone and i need my photos back my phone isn't backed up

There are many ways of preserving photos and videos. Did you do any of these?

• emailed, texted or messaged the photos to friends or family
• iCloud photo sync
• Manual iCloud backup
• Automatic nightly iCloud backup
• iTunes backup
• Transfer your photos to your computer via USB cable
• Sync to Google Photos
• Sync to some other photo archiving service such as Shutterfly
• Sync to Dropbox
• Sync to box.com
• Sync to Microsoft OneDrive
• Sync to Amazon Photos
• back up to Livedrive
• Backup to any other backup or archiving service
• Transfer them to a Flash drive through the lightning port on your iPhone, using a product such as SanDisk 64 GB iXpand Flash Drive Go - Apple

A final option is if you synced your photos to iCloud, you have a Mac, and you use Time Machine to back up your Mac automatically, you can open Time Machine and restore the photo library to an earlier date. To do this on your Mac open Finder, then click on Pictures in the sidebar and launch Time Machine. Go to a time before the photos were deleted and restore

Photos Library.photoslibrary. (If you had ever changed the name of the photo library restore that file instead).

If the answer is no to all of the above your photos are gone forever.

If you are lucky the phone will have uploaded your photos to iCloud. Point your web browser at https://www.icloud.com/photos and try to login with your Apple ID and password.

If you are even more lucky you might be able to go to https://www.icloud.com/find and locate your iPhone. See All Apple's advice in If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Sorry, if it is true that you have no backup at all.......the photos are gone, unless you can find the phone.

Did you have iCloud Photos turned on? If so, any photos that your iPhone had the chance to upload to the cloud have copies in the cloud. You can access these from iCloud Photos on another Apple device, or from the iCloud Photos Web interface.

https://www.icloud.com/photos

If your photos were not backed up, and you were not using iCloud Photos (or another service like Google Photos), your only hope for retrieving the photos is to find the phone.

Are you SURE that your images aren’t sync’d to your iCloud ?

Setting up a brand new iPhone and simply accepting the default iOS settings turns iCloud Photos “on.”