PANews reported on February 24 that CZ wrote an article titled "Protect Your Cryptocurrency #SAFU" on Binance Square, in which he mentioned:

In terms of using mobile phones, CZ recommends using an iPhone. If you are more tech-savvy, it is recommended to use an Android phone equipped with GrapheneOS. It is recommended to use only one phone to store the wallet and not mix it with the phone you use daily. The phone should only have the wallet software installed and nothing else. Except when using the wallet to transfer money, the phone should always be put in airplane mode. It is also recommended to use a separate SIM card for the phone and only use 5G to connect to the Internet, and never connect to any WiFi.

In terms of email, CZ recommends using Gmail or Protonmail and setting up a unique email account for each exchange you use, which makes it difficult to guess and if there is a problem with another exchange, your Binance account will not be affected, and it will also reduce the number of phishing or targeted email scams you receive.