I can’t open my Mail box in my iPhone it’s show me add account and when add the account it’s show already add the account

Hello AdnanZay,

It sounds as though you're attempting to sign in to an email account on your iPhone but you're being prompted that it's already signed in. From the information you've provided, updating IOS is a great first step to help resolve this issue. The latest iOS version is iOS 15.6.1 and you can update using the steps listed below. These steps, along with how to update iOS using a computer can be found in the following article.

"Update your iPhone, iPad, or iPod touch wirelessly"

1. "Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see two software update options available, choose the one that you want to install.
5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do."

You might see that your device is up to date and that there's an upgrade available. For example, even if your device is up to date with the latest version of iOS 14, there might be an option to upgrade to iOS 15. You might want to upgrade iOS when you pair an accessory with iPhone.

Update your iPhone, iPad, or iPod touch

Let us know how that goes!