Question: how to change whatsapp background for one contact iphone?
Answer: Press the home button and open WhatsApp. Tap on the back arrow in the top-left corner if you are in a chat. Tap on "Settings". Tap on "Chats" in the settings menu at the top. Tap on "Chat Wallpaper". Tap on either "Wallpaper Library" or "Photos" to set wallpaper.