You secure your accounts with two-factor authentication

Please also bear in mind that it must be possible to create a backup of your second factor. A cell phone number is not really a good second factor. Firstly, you can potentially lose your number. But it is also possible that other people or authorities can gain access to your number. If you lose your SIM card, you won't be able to access your accounts for the time being. If you use a hardware token as a second factor, please make sure that there is a second one for emergencies! If you use software solutions such as Time-Based-One-Time-Passwords, please create backups in your OTP apps! The Android app Aegis, for example, offers automatic backups.