Best answer: No. The Pixel 3a is very similar to the design of the Pixel 3, but because of some design upgrades including a slightly bigger battery, slightly larger screen, and the return of the headphone jack, the Pixel 3a is just different enough that Pixel 3 cases won't quite fit.
A brand new phone means brand new cases
In many ways, the Pixel 3a is nearly identical in design to the Pixel 3, but it's just different enough that a Pixel 3 case just won't work. The dimensions of the Pixel 3a are slightly taller and thicker than its predecessor, meaning Pixel 3 cases just won't fit — and even if you do squeeze the Pixel 3a into a Pixel 3 case, the volume and power buttons won't line up with the cutouts.
The added thickness is likely due to the slightly larger battery — now an even 3000mAh capacity, up from 2915mAh. The rest of the frame is slightly taller and narrower than the older Pixel 3 to accommodate the slightly taller 18.5:9 screen and the downward facing bottom speaker.
More critically, the Pixel 3a reintroduces the headphone jack which would mean that any Pixel 3 case would cover that right up — and we wouldn't want to do that, would we?
Google's budget smartphone offers a great deal
The Google Pixel 3a is almost a return to form for fans of the Nexus line. Most of what you love about the Google Pixel 3 specs are here, including that outstanding camera and clean Android software, along with the return of a headphone jack and cool discount price.
Slim and rugged
What makes the Spigen Rugged Armor stand out over the competition, in my opinion, is the supreme combination of ruggedness and a sleek design. This is a one-piece case that offers solid protection in the corners without adding much bulk to the phone.
Best clear case
Spigen's Liquid Crystal series is a top recommendation for any phone because it delivers a minimalist design that still offers great protection. It's the perfect pick for anyone who loves to show off their new phone but still needs to keep it safe.
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