Clint Barton, has a Pixel 3.

Barton uses a Just Black Pixel 3, but the UI is custom and does not look like Android whatsoever.

His wife Laura uses a Pixel 3 in Not Pink, and we do see the native Google Phone dialer.

That means, canonically, Clint Barton enjoys his Pixel phone enough to the point where he bought another.

Meanwhile, Kate Bishop uses a Just Black Pixel 4 running a very custom OS that actually makes sense given the context of the story.

Marvel Studios might just like using Google phones and have familiarity with green-screening them on running custom UIs/workflows?

We're skeptical that Google planned Pixel 5 w/ Tensor