Those who use older iPhones tend to look at new iOS releases with a hint of suspicion. After all, installing a new iOS update can cause performance problems, and since updating is essentially a one-way journey, it can be problematic to install it on a gamble.
So, will iOS 12.4 slow down your iPhone?
In testing I’ve carried out, my answer is a conclusive “no.” Older iOS devices operate and run like they did under iOS 12.3.1.
