Push notifications are messages your iPhone receives from apps and websites, even when you're not using them
A push notification is a short message that appears on your iPhone's lock screen, home screen, or in the notification center without you opening the app first. The app or website sends it to Apple's servers, which then deliver it to your phone. Unlike email, which you check when you open Mail, push notifications arrive on their own schedule — often when ready — and interrupt whatever you're doing.
The word "push" describes the direction: the app pushes the message to you, rather than you pulling it by opening the app. This is why notifications feel intrusive. A weather app doesn't wait for you to check it; it pushes an alert about rain. A news site doesn't wait for you to visit; it pushes a headline. A messaging app doesn't wait for you to open it; it pushes a notification that someone replied.
Push notifications work because your iPhone stays connected to Apple's push notification service in the background, even when you're not actively using it. When an app wants to send you a message, it contacts Apple's servers with your device's unique identifier, and Apple delivers it to your phone. This is different from older notification systems that required the app to stay running or to check for updates constantly — which would drain your battery much faster.
Key Takeaways
- Push notifications are messages sent by apps and websites that arrive on your iPhone without you opening the app, and they interrupt you when ready.
- Your iPhone connects to Apple's push notification service in the background, which is how apps can reach you even when you're not using them.
- Each app can send different types of notifications — some silent, some with sounds, some with badges that show a number on the app icon.
- You control which apps can send notifications and how they appear, either by turning them off entirely or by choosing which notification styles you see.
How notifications reach your phone from the app's servers
When you install an app, it asks permission to send you push notifications. If you allow it, the app registers with Apple's push notification service and receives a unique token — a long string of characters that identifies your specific iPhone. The app sends this token to its own company's servers.
Later, when the app company wants to notify you — say, when someone sends you a message, or when a sale starts, or when a news story breaks — their servers contact Apple's push notification service with your token and the message content. Apple's servers then find your iPhone and deliver the notification. This happens in seconds, which is why push notifications feel when ready.
The app company never has a direct connection to your phone. They can't reach you without going through Apple first. This is a security feature: it prevents apps from constantly pinging your phone or accessing your location without your knowledge. Apple acts as the middleman and can enforce rules about what notifications are allowed.
The different types of notifications you might see
Push notifications come in several visual styles, and apps can use more than one type. A banner is a thin bar that appears at the top of your screen and disappears after a few seconds. A lock screen notification shows on your lock screen and stays there until you swipe it away. A notification center alert appears as a larger box that you have to dismiss before continuing. Some notifications are silent — they add a number badge to the app icon (like a red circle with "3" on Messages) but don't make a sound or show a banner.
Apps can also send notifications with sounds, vibrations, or both. Some notifications are critical alerts — these bypass your Do Not Disturb setting and always make a sound, and only certain apps like Health or Home are allowed to send them. Most regular app notifications respect your Do Not Disturb setting, meaning they won't interrupt you if you've turned that feature on.
You don't have to accept all these notification styles from every app. You can tell an app to send only silent badges, or only banners, or nothing at all. You make these choices in Settings under Notifications, where each app has its own rules.
Why apps want to send you notifications
Apps send notifications for different reasons. Some are genuinely useful: a messaging app notifies you that someone replied, a calendar app reminds you of an appointment, a banking app alerts you to unusual activity. These notifications help you stay informed about things that matter to you.
Other notifications are designed to bring you back into the app, whether or not you need the information. A game might notify you that your energy has refilled. A shopping app might notify you about a sale. A social media app might notify you that someone liked your post. These notifications are meant to re-engage you — to make you open the app and spend more time in it. The more time you spend, the more ads you see or the more data the company collects about you.
Some apps send notifications because their business model depends on it. Free apps often rely on advertising or on selling your attention, so they have financial incentive to interrupt you as much as possible. Paid apps or subscription services have less incentive to annoy you, because you've already paid them.
How notifications differ from other alert types on iPhone
Push notifications are different from in-app notifications, which only appear when you're actively using an app. If you're reading an article in Safari and the website wants to show you a banner, that's an in-app notification — it doesn't reach you when you're not on that website.
They're also different from SMS text messages and iMessages, which are sent through cellular networks or internet connections rather than through Apple's push service. Text messages appear in the Messages app and are treated as a separate notification system with their own settings.
Email notifications work differently too. When Mail receives an email, it can send you a push notification about it, but the notification is separate from the email itself. You can turn off email notifications while still receiving emails, or you can receive notifications only for emails from certain people.
What information apps can include in a notification
A push notification can contain a title, a message, and sometimes an image or action buttons. For example, a messaging app might send: "Sarah: Are you free tonight?" A news app might send: "Breaking: Storm warning issued for your area." A delivery app might send: "Your package is out for delivery" with a button to track it.
Apps cannot include sensitive information like passwords or full credit card numbers in notifications, because notifications appear on your lock screen where anyone can see them. If an app needs to show you something private, it will send a generic notification like "You have a new message" and make you open the app to see the actual content.
The notification itself doesn't contain your personal data — it's just a message. The app company knows you received it (because they sent it), but they don't know whether you read it, when you read it, or what you did after reading it, unless you open the app and they track your activity inside it.
Frequently Asked Questions
Can apps send notifications if I've turned off notifications for that app?
No. If you've disabled notifications for an app in Settings, that app cannot send you any push notifications. The app can still function normally — you just won't be interrupted by messages from it. You can always open the app manually to check for updates.
Do push notifications use my data or battery?
Push notifications use very little data — usually just a few kilobytes per notification. They do use some battery because your iPhone has to stay connected to Apple's push service, but this is far more efficient than having apps constantly check for updates on their own. Turning off notifications for apps you don't need will save slightly more battery.
Why do some apps ask for notification permission when I first open them?
Apps must ask your permission before they can send push notifications. This is an iOS security feature. If you tap "Don't Allow," the app cannot send you notifications unless you change your mind later in Settings. You can change your answer anytime without uninstalling the app.
Can I get notifications from a website without installing an app?
Yes. Websites can ask permission to send push notifications through Safari, and if you allow it, you'll receive notifications from that website even when you're not browsing it. These work the same way as app notifications — they go through Apple's push service. You can turn them off in Settings under Notifications, just like app notifications.
What happens to notifications if my iPhone is turned off?
Notifications sent while your iPhone is off are held by Apple's servers and delivered when your phone turns back on. You'll see them all at once, usually within a few seconds of powering up. Very old notifications may be discarded if they're no longer relevant.