If your iPhone, iPad, or iPod touch has iOS 9.3 or later:
If the pop-up won't close or reappears, you can tap in the Smart Search field and enter a new URL or search term.
Or just close the tab: Tap double square box icon and then tap X on that tab.
If your iPhone, iPad, or iPod touch has an earlier version of iOS:
If you see a Block Alerts button after you dismiss a pop up multiple times, tap the button to stop showing alerts from that webpage.
If you can't close a pop-up, force Safari to close. To prevent Safari from automatically reopening any windows, go to Settings > Safari, then tap Clear History and Website Data. (This also removes your browser history and cookies.)
Block Ads in your Browser Using your Browser Settings (Your Android browser already has a built-in pop up blocker!)
Open your browser.
Tap the three dots menu icon in the top right corner of your screen and tap settings.
Tap Advanced from the menu that appears.
Look for the Block pop-ups setting and make sure it’s enabled
After enabling this setting, your smartphone should never display another pop-up advertisement again.
Block Pop-Up Ads on Chrome (Chrome has a similar settings menu you can use to disable pop up ads forever.)
Open Chrome and tap the three dots menu in the top right hand corner.
Scroll down to Settings and tap it.
Scroll down to and tap on Site settings and then Pop-ups. Tap that option.
By default, pop-ups are blocked on Chrome for Android. However, sometimes you may have changed settings inadvertently or a third party app may have edited your settings. If it says pop-ups are allowed, move the slider to change this option to Pop-ups Block.