^ The same as gentlemand. Use OTP instead of SMS 2FA.

As he said, you can use Google Authenticator, but in case you don't want to keep saving your secret codes or QR everytime you enable 2FA in a new service and can afford to buy an android app, I recommend you using Authenticator Plus that lets you backup all your 2FA accounts easily.

There is also other alternatives like FreeOTP which is free and IMO still better than Google Authenticator, or Authy which also has cloud backup but makes your 2FA less safer.