how do i transfer old iphone info to new iphone

The best way for a complete transfer is to make an iTunes computer backup (if you have a computer) or an iCloud backup of your old iPhone (if you have enough space an iCloud), and then restore that backup onto your new iPhone.

How to back up your iPhone, iPad, and iPod touch - Apple Support

Note: If you use the iTunes/computer backup method be sure and select to do an "encrypted" backup w/ a password as that backs up more than an unencrypted backup.

The other option is if your old iPhone is set to use iCloud for storing Photos, Contacts, etc., is to simply sign in to the same iCloud on your new iPhone and your iCloud content will sync with your new iPhone.

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

See: Transfer content from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support