What is an Operating System and How it Works on Phones

Every time you turn on your phone, tap an app, or make a call, there’s something invisible working behind the scenes: the operating system. Without it, your phone would be a useless piece of metal. In this article, I’ll explain what an operating system is and how it works on your phone, in simple terms without unnecessary jargon.

Table of contents

What exactly is an operating system

An operating system is the fundamental software that manages everything your phone does. It’s like the conductor of an orchestra: coordinating every piece of hardware (screen, camera, processor, memory) so they work together harmoniously.

When you open WhatsApp, it’s not your phone directly running the app. It’s the operating system that:

• Allocates RAM to the application
• Manages the internet connection to send messages
• Controls the screen to show you chats
• Manages battery so it doesn’t drain immediately

Without an operating system, you’d have to manually program every instruction for every component. Imagine having to write code just to make the screen display a pixel. The operating system does that for you automatically.

The two dominant mobile operating systems are Android (by Google) and iOS (by Apple). Together they account for over 99% of the global smartphone market. Each has its philosophy, advantages, and limitations.

Pro-tip: When buying a new phone, check which OS version it comes with. A phone with Android 14 or iOS 18 guarantees years of security updates.

How Android works on your phone

Android is the most widely used operating system in the world, found in brands like Samsung, Xiaomi, OPPO, Google Pixel, Motorola, and many more. Its internal structure works in layers:

Hardware layer: The phone’s physical components (processor, memory, sensors). Android communicates with them through drivers.

Kernel layer: The core of Android, based on Linux. It manages memory, processes, security, and communication between hardware and software. It’s the most fundamental layer and the one you see least.

Framework layer: Where applications run. Android offers APIs (interfaces) that developers use to create apps. That’s why a camera app works on Samsung, Xiaomi, and Pixel alike.

Interface layer: What you see on screen. Here’s where brand customization comes in: Samsung has One UI, Xiaomi has HyperOS, OPPO has ColorOS. All based on Android, but with different looks.

Every year Google launches a new Android version. Recent versions include Android 13, 14, and the recent Android 15, each with security, performance, and new feature improvements.

How iOS works on iPhone

iOS is Apple’s operating system, designed exclusively for iPhone. Unlike Android, iOS is a closed system: Apple controls both hardware and software.

This has clear advantages:

• Perfect optimization: By designing both parts, Apple makes software get the most out of hardware.
• Security: Fewer open doors for malware and viruses.
• Consistency: All iPhones update at the same time.
• Performance: Even with less RAM than Android, iOS tends to be smoother.

But it also has limitations:

• Less customization: You can’t change the launcher, default apps are limited.
• Closed ecosystem: You have to use App Store for everything, no alternatives.
• Price: iPhones are significantly more expensive.

iOS’s internal architecture is similar to Android in concept: kernel, framework, and interface. But Apple uses its own kernel (based on Unix/XNU) and its own programming language (Swift) instead of Android’s standard (Java/Kotlin).

In my opinion, the choice between Android and iOS depends more on your values than specs. If you value customization freedom and price, Android. If you value simplicity and integration with other Apple devices, iOS.

What the operating system does for you daily

To make clear what the operating system constantly does, here are everyday examples:

When you receive a call:

1. The OS detects the network signal.
2. Shows the notification on screen.
3. Activates the speaker or earpiece.
4. Manages the audio connection.
5. If you’re using another app, pauses it and shows the call screen.

When you open the camera:

1. Allocates processor resources to the camera app.
2. Activates the image sensor and lens.
3. Manages storage to save photos.
4. Applies filters and real-time processing.
5. Controls flash if needed.

When using GPS:

1. Activates connection with satellites or cell towers.
2. Calculates your position in real-time.
3. Shows the map on screen.
4. Calculates routes and estimated times.
5. Manages battery so it doesn’t drain with GPS on.

All this happens in milliseconds without you having to do anything. That’s the magic of the operating system: it makes the complex seem simple.

How to update your operating system

Keeping your operating system updated is crucial for security and performance. Here’s how:

On Android:

1. Open Settings.
2. Go to System > System update.
3. Tap “Check for update”.
4. If available, download and install it.

On iOS (iPhone):

1. Open Settings.
2. Go to General > Software Update.
3. If an update is available, tap “Download and Install”.

Pro-tip: Before updating, make a full backup. Connect to WiFi and make sure you have at least 50% battery. Updates can take anywhere from 15 minutes to an hour.

Updates include:

• Security patches: Fix vulnerabilities hackers could exploit.
• Performance improvements: System runs faster and more efficiently.
• New features: Characteristics that weren’t available before.
• Bug fixes: Solves known problems and errors.

An unupdated phone is like a house with an unlocked door. Hackers actively search for devices with outdated software because they’re easy targets.

How to choose the OS for your next phone

If you’re thinking about buying a phone and don’t know which operating system to choose, consider this:

Choose Android if:

• You want variety of brands and prices
• You like customizing your phone
• You prefer more app options
• You don’t want to spend too much

Choose iOS if:

• You already have other Apple devices (Mac, iPad, Apple Watch)
• You value security and privacy
• You want updates for many years
• You prefer simplicity over customization

Within Android, brand differences are important. Samsung offers the best general experience, Xiaomi has the best value for money, and Google Pixel has the purest Android with the best photos.

FAQ

What operating system does my phone have?

On Android, go to Settings > System > About phone. On iOS, go to Settings > General > About. There you’ll see the exact OS version.

Can I change my phone’s operating system?

Not practically. Each phone is designed for a specific operating system. Installing another OS (like Android on an iPhone) isn’t viable and would void the warranty.

How long does a mobile operating system last?

Modern phones receive between 3 and 7 years of updates. Samsung flagships get 4-5 years of Android. iPhones get up to 7 years of iOS. After that, the phone works but without security updates.

Is Android or iOS more secure?

iOS is generally more secure due to its closed nature. However, Android has improved significantly in recent years. An updated Android from a known brand is safe for daily use. The key is keeping your OS updated.

Conclusion

The operating system is the invisible heart of your phone. Without it, you couldn’t do anything. Both Android and iOS are excellent options, each with their strengths. The most important thing is keeping your operating system updated to enjoy the latest features and protect your security. Now that you know what an operating system is and how it works on your phone, you can make better choices when selecting and using your smartphone.