Gỡ iCloud trên điện thoại

"Remove iCloud on your phone" source.

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Removing iCloud from an iPhone:

So, what are you looking to perform here?

A. Removing the iCloud App:

You can't. iCloud is a not an app.

B. Making iCloud Inaccessible:

If you do not want access to it, then turn it off in Settings..

1. Go to: Settings
2. Tap: [your Name] (very-top item)
3. Tap: iCloud
4. Tap: See More
5. Toggle Off: each item

C. Logging Out if the Apple Account:

Is this a used device? If so, you need to have the person currently signed into their Apple Account on it, sign themselves out of it. Elsewise, it is useless to you. This is the site the seller should have used prior to ridding of it What to do Before you Sell, Give Away, or Trade In your iPhone or iPad - Apple Support. The seller should have known better.