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I tried, but I have an iPhone so I 1) can't get the Binance app and 2) they direct me to set up 2fa on my PC??

It is quite easy.

  1. Download 'Google Authenticator' in your mobile.

  2. Long in on your binance account from a pc.

  3. Enable Google Auth from your binance account.

  4. Go back to your phone. Open the Google Authenticator. Scan the barcode/Qr-code.