Phone Too Slow? Here's How to Fix a Sluggish iPhone or Android

A slow phone is almost never a sign that you need a new one. Nine times out of ten the cause is a full storage drive, too many apps left running, or software that simply needs restarting. Each of those takes a few minutes to fix, costs nothing, and you cannot break anything by trying. Work through the steps below in order and your phone will usually feel noticeably quicker before you reach the end.

The slowness creeps in gradually, which is why it is easy to assume the phone is just "getting old". In reality, a phone you bought three or four years ago has plenty of life left. It has only become cluttered, the way a kitchen drawer fills up over time. Clearing that clutter is the whole job.

Start with the one fix that works most often

Restarting your phone clears its short-term memory and shuts down anything that quietly got stuck in the background. It is the single most effective fix, and a phone that has run for weeks without a restart is often the slow phone. Many people never turn their phone fully off, so it never gets this fresh start.

On an iPhone with a Home button, hold the side button until "slide to power off" appears, slide it, wait until the screen is fully dark, then hold the side button again until the Apple logo shows. On a newer iPhone without a Home button, hold the side button and either volume button together to reach the same slider. On most Android phones, hold the power button (or power plus volume up) and tap Restart.

Give it a full minute to start up again before you judge the result. If the phone feels quicker straight away, that was the cause, and a weekly restart will keep it that way. If it is still sluggish, move on to storage, which is the next most common culprit.

Free up storage space

A phone that is almost full slows right down, because the system needs free space to work in, the way you need clear counter space to cook. When storage drops below roughly 10 percent free, everything gets sticky: apps launch slowly, photos take a moment to open, and the keyboard can lag behind your typing.

To check on an iPhone, open Settings, tap General, then tap iPhone Storage. On Android, open Settings and look for Storage (sometimes inside Battery and device care). You will see a bar showing how full the phone is and a list of what is taking up room. Photos and videos are usually the biggest users, followed by a few large apps.

The quickest wins are deleting apps you no longer use, clearing old downloads, and removing duplicate or blurry photos. Both phones can also offload large message attachments. If your photos are backed up to iCloud or Google Photos, you can safely remove the local copies and still see them whenever you want.

Close and tidy your apps

Dozens of apps left open in the background nibble away at your phone's memory and slow it down. Closing them gives the phone room to breathe. On an iPhone with no Home button, swipe up from the very bottom of the screen and pause in the middle to see your open apps, then flick each card up to close it. On an iPhone with a Home button, press it twice quickly. On Android, tap the square or three-line button at the bottom, or swipe up and hold, then swipe each app away.

While you are at it, look at which apps you actually use. A phone with 120 apps is harder to keep quick than one with 40. Delete the ones you have not touched in a year. On an iPhone, press and hold an app icon, tap Remove App, then Delete App. On Android, press and hold the icon and drag it to Uninstall, or do it from Settings. You can always reinstall later for free.

Some apps also run constantly in the background even when closed, refreshing for updates. Turning that off for apps that don't need it helps. On iPhone, Settings, General, Background App Refresh. On Android, it lives under each app's battery settings. Leave it on for messaging apps you rely on, and switch it off for the rest.

Install pending updates

Out-of-date software is a quiet cause of slowness, and updates often include speed and battery improvements as well as security fixes. A phone that nags you about an update for months is missing those gains. Updating is free and your data stays exactly where it is.

To update the phone itself on an iPhone, open Settings, tap General, then Software Update, and follow the prompts. On Android, open Settings, scroll to System (or About phone), and look for System update. Plug the phone in and connect to Wi-Fi first, because updates can be large and take a little while.

Your apps need updating too. On an iPhone, open the App Store, tap your photo or initials at the top right, and scroll to update all. On Android, open the Play Store, tap your profile picture, tap Manage apps and device, and update what's pending. Keeping apps current often fixes the exact app that felt slow or crash-prone.

Tackle a battery that drains too fast

A phone that suddenly runs hot, drains quickly, and feels slow at the same time usually has one app misbehaving. Both phones can show you the culprit. On an iPhone, open Settings, tap Battery, and look at the list of apps by battery use. On Android, open Settings, tap Battery, then Battery usage. An app near the top that you barely use is the one to update, force-close, or remove.

On older phones, the battery itself wears down over years and can cause the phone to slow itself deliberately to avoid sudden shutdowns. On an iPhone you can check this in Settings, Battery, Battery Health. If maximum capacity has dropped below about 80 percent, a battery replacement (often $70 to $100 at an Apple Store or repair shop) can make an old phone feel new again, far cheaper than replacing the whole device.

When a slow phone really does need replacing

Most slow phones do not need replacing, but a few do. If your phone is more than five or six years old and no longer receives software updates, it will gradually fall behind, because newer apps are built for newer systems. At that point, even a clean, restarted phone with free storage may struggle with modern apps.

Before you spend money, try the steps above first, because they cost nothing and often solve the problem completely. Restart the phone, free up storage, close and trim your apps, install every update, and check the battery. If after all that the phone still crawls and it has stopped getting updates, replacement becomes reasonable. Otherwise, you have just saved yourself a few hundred dollars.

If you do decide to upgrade, you do not need the newest, most expensive model to get a fast phone. A model that is one or two years old is plenty quick for messaging, calls, photos, and video chats, and a phone shop or a tech-savvy relative can move your photos, contacts, and apps across in an afternoon.