Use the Move to iOS app during iPhone setup
Back up Android photos to Google Photos, then install Google Photos on iPhone and sync
Upload photos to Google Drive from Android, then download them on iPhone
Use a computer to copy photos from Android to the computer, then transfer them to iPhone with Finder or iTunes
Send photos through email or a messaging app and save them on iPhone
Use a cloud service like Dropbox or OneDrive to upload from Android and download on iPhone
Transfer photos with a USB cable and a file transfer app on the computer
Use AirDrop alternatives like SHAREit or Send Anywhere if both devices support them
Move photos from Android to an SD card, then import them to iPhone through a computer
Use a third-party transfer app designed for Android to iPhone photo migration