[Update 2] The S22+ and Ultra are now both $600 off, which is amazing. It was previously $500 off. On top of that, there are also various creative ways to use your Fi credit toward buying a phone—have to give credit to the experts for figuring this out.
[Update] Buying a phone can trigger it.
It’s rare to see a good Google Fi deal like this. If you already have a real need for it, go ahead and jump on it.
About Google Fi: