Storing seed phrases for cryptocurrency wallets on Apple iPhone 11 and earlier smartphone models carries serious security risks that cannot be eliminated even by fully resetting the device to factory settings and activating airplane mode. This warning was issued by Yishi Wang, founder of hardware wallet manufacturer OneKey.
The core problem lies in the hardware vulnerabilities inherent to these devices at the chipset level. Unlike software bugs that can be closed with an iOS update, these flaws are fundamental in nature and cannot be fixed through operating system patches.
According to Wang, attackers who gain physical access to such a device can exploit hardware gaps to extract confidential information — including seed phrases stored in protected memory areas. Factory reset and disabling network modules do not provide an adequate level of isolation, since the attack occurs at a level inaccessible to software-based protections.
Why this is critical for crypto asset holders
A seed phrase is the master key to a wallet: its compromise means complete loss of funds with no possibility of recovery. The practice of storing mnemonic phrases in notes, messengers, or a smartphone's photo gallery remains one of the most common mistakes among retail users, significantly increasing the attack surface.
For devices with hardware vulnerabilities, even physical isolation of the gadget does not guarantee security. It is recommended to avoid entering and storing seed phrases on smartphones older than the iPhone 11, and for long-term key storage to use specialized hardware wallets with Secure Element protection or offline media.
Cryptalist analysis: The incident underscores a fundamental principle of crypto security: software measures cannot compensate for hardware defects. As the value of digital assets in retail investors' accounts grows, the risks associated with insecure key storage on consumer devices will intensify, creating sustained demand for specialized hardware storage solutions with verified component bases.