A few months ago, Google introduced an anti-phishing feature for Gmail on Android after a widespread attack affected millions of users. Now, Mountain View is adding the extra security measure to Gmail for iOS. Sometime within the next 15 days, a warning message will pop up when you click on a suspicious link. It will let you know that the URL you want to access leads to an untrusted site, and it will ask if you're absolutely sure you want to continue.