That is a scam and should be ignored.
iDevice Safari Phishing Adware Popups
- Your device does not have a virus. You can fix this as follows:
- Kill Safari by double-tapping on the Home button. Locate Safari in the taskbar, then slide the Safari mini-page upwards so it vanishes.
- Tap Settings > Safari > Clear History and Website Data. Next, locate Security section and slide the “Block Pop-Ups” switch to the On position.
- Press the Home button to return to your Home screen.
- If this doesn’t help, then reset your device. It won't delete your data. Press and hold down the On/Off button and the Home button until the display turns off and returns with the Apple logo showing.
Alternatively, follow these instructions to reset your device: Restart your iPhone, iPad, or iPod touch - Apple Support.
These are scams and should be ignored
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Report phishing email to abuse@apple.com.