Clean Your iPhone (Inside and Out)
You have to clean your iPhone. Not only will this help kill illness-causing bacteria, but it also just feels better when your iPhone is clean. Keep in mind that you also need to take care of the inside.
Although it won’t necessarily damage it, what you have stored in your iPhone can make your device feel more sluggish because the iPhone is constantly trying to make more room for your content. Even if you have a lot of storage, you might see that your iPhone starts to slow down if you’re using most of it. Deleting old files, apps, and pictures can go a long way to help your iPhone’s performance.