Hello Grandma273,
Thanks for posting in the Apple Support Communities.
Do you know if you were using iCloud Photos on your old phone? If so, you can go to Settings > Your Name > iCloud and enable Photos. This will allow photos stored in iCloud Photos to sync to your device and any photos on your iPhone to sync to iCloud.
Set up and use iCloud Photos - Apple Support
If you weren't using iCloud Photos, and they were simply saved in a backup, then you could restore your device. The downside to this option is that any data you've accumulated since the last backup on your old iPhone will be lost.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
Best regards.