We recommend using the authenticator app to log in on your phone. It's not as secure as the key (since you can still get phished) but one to mitigate that is to

We recommend using the authenticator app to log in on your phone. It's not as secure as the key (since you can still get phished) but one to mitigate that is to type in the gmail URL by hand. An iPhone is so much more secure than any laptop that it more than makes up for the small drop in second-factor security.