Question: how to change whatsapp wallpaper for one contact iphone x?
Answer: Open WhatsApp.
Tap Menu.
Tap Settings.
Tap Chats.
Tap Wallpaper.
Tap one of three options: Gallery (your photos) Solid Color (WhatsApp default) WallpaperLibrary (WhatsApp default)
Tap a new wallpaper image.
Tap Set.