Use the Move to iOS app during iPhone setup
Connect both phones to Wi-Fi and power
On Android, install and open Move to iOS
On iPhone, choose Move Data from Android
Enter the code shown on iPhone into Android
Select Photos and transfer the files
Use Google Photos to back up pictures on Android
Install Google Photos on iPhone and sign in
Download the photos to the iPhone if needed
Use a computer to copy photos from Android
Import the photos to iPhone through Finder, iTunes, or Photos
Use a cloud service like Google Drive, Dropbox, or OneDrive
Upload photos from Android and download them on iPhone
Use email or messaging apps for a small number of pictures
Use a USB transfer app or cable if supported by both devices