Most of them use iOS 12. And that's a good thing, because you have a faster experience with it many patched bugs and vulnerabilities as possible. This is especially important because Google researchers recently uncovered six major iOS vulnerabilities that Apple fixed in iOS 12.4 earlier this month.
The problem? There are two reasons. First, there are still many people who do not use iOS 12 for some reason – and probably not even iOS 12.4. Although Apple's own statistics do not break down any specific iOS versions, the company shows that about 13 percent of all iPhones and iPads purchased in the last five years are not running on iOS 12. Given the number of devices sold by Apple (well over a billion iPhones) alone between 2016 and 2018) 13 percent are much more devices, as this number suggests at first glance.
Second, one of these "interactionless" bugs identified by Google researchers in iOS has not been fully resolved. 12.4. They are described as such because an attacker only has to send a message. This can be a text message, a multimedia message, an iMessage, an e-mail or a visual voicemail, according to Google security engineer Natalie Silvanovich. 19659005] When you look at the message, the malicious code invented by the attacker is executed – in four of the six vulnerabilities that have been exposed. The other two cases simply read files from your iPhone or iPad. We hope you have nothing insulting or super secret on your device.
Do not use older versions of iOS anymore.
Luckily, you're protected from five of these six vulnerabilities by an update to iOS 12.4. However, you should not have to wait until we convince you to search for iOS updates. Every three months, create a recurring calendar event labeled "UPDATE MY IPHONE" in large, annoying text. Or do what I do and pull Settings> General> Software Update constantly high because you love to live on the bloody ridge.
From iOS 12, you can even enable automatic updates. However, as Apple notes, you may need to manually update your device from time to time. (Even though I've enabled this setting, I'm probably checking my iPhone for updates more often than I should.)
If you stick to it because you love the look of your older version of iOS, you'll have to weigh that against the possibility that An attacker could come after your unpatched device. Are the chances low? For sure. Would I risk and having a slower iPhone? No.