What Is Open Source, and Does It Affect Me?
The smartphone world is dominated by two ecosystems: the open Android and the closed iOS (Apple).
Android relies heavily on open source — what people commonly call an “open-source system.” An “open-source system” means the code is public and developed and improved collaboratively by engineers worldwide. For example, the core of Android is built on open-source technologies like Linux. Open source drives rapid innovation, but it also means attackers can more easily study system weaknesses. Apple’s iOS, by contrast, is a closed system — but any errors in its underlying code still generate global-scale risk.
Forbes.com and the Jerusalem Post both reported in October 2025 that the Israel Defense Forces announced: senior officers’ official phones would be entirely banned from using Android, switching exclusively to iPhone.
The IDF recently published new cybersecurity regulations specifying that officers at the rank of lieutenant colonel and above may no longer use Android phones for official duties and must switch to iPhone. This move aims to reduce the risk of hacking, data leakage, and enemy infiltration at senior military levels, further enhancing communication security.
Military officials noted that while Android devices are widely used by governments and enterprises globally — and some models have even received defense-grade security certifications — switching to iPhone offers more consistent management, update control, and security uniformity, effectively reducing potential vulnerabilities and strengthening mobile security. This regulation took effect on a rolling basis and is expected to become a key measure in the military’s cybersecurity reinforcement.
But is iOS (iPhone) actually more secure than Android? Regardless of which system your phone uses, it may seem unrelated to ordinary people — yet it subtly affects security during use. Here are some examples of security vulnerabilities:
Case 1: iOS and Android Vulnerabilities and “Zero-Day Exploits” — From Targeting Celebrities to Threatening Everyone
As attack techniques have matured, vulnerabilities in major platforms are being rapidly discovered. Typically, security researchers privately notify vendors before publicly disclosing vulnerabilities, giving vendors sufficient time to issue patches before public announcement, to avoid large-scale security incidents. However, some hackers do not disclose their discovered vulnerabilities in advance — they directly attack vulnerable devices for commercial or other gain. All public devices become potential targets, catching vendors completely unprepared with no time to respond. Hence the term “zero-day attack.”
Looking at 2024 and 2025 data, the scale of the threat is clear:
In 2024, 162 Android security vulnerabilities were found, and 5 zero-day attacks occurred. In 2025, 133 vulnerabilities were found and 6 zero-day attacks occurred. Android’s more open system, diverse device brands, and greater hardware/software variability result in a broader attack surface and higher vulnerability count.
On the iOS side, 2024 saw 28 security vulnerabilities and 7 zero-day attacks; 2025 saw over 90 vulnerabilities and 7 zero-day attacks. This shows that even the “closed, more secure” iPhone continues to have weaknesses discovered, with a significant proportion being zero-day attacks that hackers can exploit immediately while official patches are still pending.
Zero-day attacks are nothing new. As early as 2021, The Guardian and 16 international media outlets revealed that Pegasus, spyware from Israel’s NSO Group, had been used by multiple governments for mass surveillance — one of the most representative zero-click attack cases in recent years. Victims included French President Emmanuel Macron, Indian opposition leader Rahul Gandhi, Washington Post journalist Jamal Khashoggi, and countless journalists.
Case 2: Fraud via App Side-Loading Channels Is Rampant
App side-loading refers to downloading and installing apps from sources other than official app stores (such as Google Play or the Apple App Store), bypassing the official store’s security review and verification processes. Common methods include using USB, Bluetooth, Wi-Fi, or memory cards to manually install Android APK or iOS IPA files onto a phone or tablet.
While side-loading may seem like just “more convenience” or “letting you install apps not in the store,” it actually carries significant risk for ordinary users. These apps have not passed official security checks — they may contain malware or hidden trackers, or may mimic the login screens of banking apps, LINE, or Facebook Messenger to steal account credentials. Worse, some Android system vulnerabilities allow side-loaded apps to easily obtain elevated privileges they should not have, leading to personal data leaks, mobile payment theft, and compromised online shopping accounts.
Simply put: side-loading removes one layer of “official gatekeeping,” making your phone a much easier entry point for hackers.
Common harms for ordinary users include:
- Theft of LINE, Instagram, Facebook, or Google accounts
- Fraudulent charges to online shopping platforms or credit cards
- Adware or spyware planted on the device
- Long-term monitoring of location, photos, and contacts
- Financial apps impersonated, with entered data going directly to hackers
Once a phone is infected with malware, users are often unaware. Real cases are endless. Don’t wait until financial losses or account theft before realizing something is wrong.
Conclusion: True Security Comes from Reducing Complexity
Why do iOS and Android — despite massive engineering teams and large security staffs validating their code — still have so many vulnerabilities and zero-day attacks? The fundamental reason is that these systems, due to their many features, are overly complex and their codebases enormous. The longer the code, the more complex the system, the more components — and the greater the probability of problems and vulnerabilities. Whether it’s the open and diverse Android (Android 15’s system footprint is approximately 20 GB) or the closed and consistent iOS (iOS 18’s system footprint is approximately 10 GB), once software reaches a certain level of complexity, errors are inevitable. Because each additional line of code, each additional feature, represents one more potential attack entry point.
This is what security experts often emphasize: “The larger the attack surface, the higher the risk.” Conversely, the smaller the attack surface, the more secure the system.
In other words: simpler means more secure. Did you know? SyPhone has only one function — voice calls — and its software size is only 1 MB, just one ten-thousandth of Android or iOS. This is the ultimate security that comes from ultimate simplicity.