Photos: One of the biggest reasons people buy iPhones is the good camera quality. Without mincing words, iPhone users take a lot of pictures.
Videos: Still on media files, iPhone users take lots of videos as well. These videos are stored on iCloud for safekeeping.
Contact: People store their contact list on iCloud as well. If you want to find out if a person has a particular contact on their iPhone, you’ll find your answers on their iCloud.
Notes: Want to gain access to people’s notes? Check their iCloud storage.
Calendar & Reminder: I’m not sure why you would need this information, but I do know you can get it on a person’s iCloud.
Location: This data is not available for most iPhone versions. But if the target is using an iPad Air 4 or an iPhone X, you should be able to track their location via iCloud.
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