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Open your iPhone's  Settings. Scroll down and tap iTunes & App Store. Tap the green "Updates" switch .
Tap the Settings app icon, which resembles a grey box with gears on it. This option is near the middle of the Settings page. Tapping it opens the App Store settings page. Doing so will cause it to turn grey {"smallUrl":"https:\/\/www.wikihow.com\/images\/2\/25\/Iphoneswitchofficon.png","bigUrl":"\/images\/thumb\/2\/25\/Iphoneswitchofficon.png\/47px-Iphoneswitchofficon.png","smallWidth":460,"smallHeight":294,"bigWidth":"47","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an iPhone icon\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}. This disables automatic app updates, meaning that none of your apps—Google Chrome included—will automatically update from now on.