There are many ways to transfer content from iphone to new iphone. You can try iTunes to do that.
Use the steps in this section to back up your previous device in iTunes and to transfer the backup to your new device. If you don't encrypt your iTunes backup, Health and Activity data from your iOS device or Apple Watch won't be saved.
Make an iTunes backup of your previous device
1. Connect your previous device to your computer.
2. Open iTunes and make sure that you have the latest version.
3. Select your device.
4. If you want to save Health and Activity data from your iOS device or Apple Watch, you need to encrypt your backup: Select the box called Encrypt [device] backup and make a memorable password.
5. After the process completes, make sure that your backup finished successfully in iTunes Preferences > Devices. You should see the name of your device and the date and time that iTunes created the backup. If you encrypted your backup, you should also see beside your device's name.
here are the 4 ways to transfer content from iphone to iphone.
if you have other ways, please let us know.