TL;DR
Officially, iPhones cannot run two operating systems simultaneously (dual boot) like some Android phones or computers can. However, there are limited workarounds involving jailbreaking and virtualisation that allow you to access another OS, but it’s complex, unstable, and not recommended for most users.
Can an iPhone Run Two Operating Systems?
Apple designs iPhones to run only iOS (or iPadOS on compatible models). The bootloader is locked down to prevent installing alternative operating systems. This is a key security feature.
Why it’s Difficult
- Locked Bootloader: Apple’s secure boot process prevents loading unsigned or modified kernels, which are essential for running an OS.
- Hardware Compatibility: Other operating systems might not have drivers for all iPhone hardware components (camera, Wi-Fi, etc.).
- Partitioning Issues: iOS uses a specific partition scheme that isn’t easily altered to accommodate another OS.
Workarounds (Advanced Users Only)
These methods are highly technical and carry significant risks of bricking your device. Proceed with extreme caution, and only if you understand the implications.
1. Jailbreaking & Virtualisation
- Jailbreak Your iPhone: This removes software restrictions imposed by Apple. Tools like checkra1n (for compatible devices) or unc0ver can be used, but they often require a computer and specific iOS versions.
brew install checkra1n - Install a Virtualisation App: Apps like UTM allow you to run virtual machines on your iPhone. These VMs can host other operating systems (Linux distributions are the most common).
- Download an OS Image: Obtain a compatible image file for the OS you want to run (e.g., Ubuntu, Debian).
- Configure the VM: Within UTM, create a new virtual machine and allocate resources (RAM, storage) to it. Point it to your downloaded OS image.
Note: Performance will be significantly slower than running iOS natively.
Limitations of Virtualisation:
- Performance: VMs are resource-intensive and can make your iPhone very slow.
- Hardware Access: Full access to all hardware features may not be possible within the VM.
- Stability: VMs can crash or become unstable, especially on older iPhones.
2. Checkra1n and Alternative Kernels (Extremely Advanced)
This involves replacing the iOS kernel with a custom one that might support loading other OSes. This is very risky and requires deep understanding of iOS internals.
Is it Worth It?
For most users, attempting to run two operating systems on an iPhone isn’t practical or worth the risk. The workarounds are complex, unstable, and can void your warranty. Stick with iOS unless you have a strong technical background and are willing to accept the potential consequences.
Alternatives
- Use Multiple Apps: iOS offers a wide range of apps that can provide functionality similar to other operating systems.
- Get a Second Device: If you need access to another OS, consider purchasing a separate device (Android phone, Raspberry Pi, etc.).