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That requires a dual-frequency receiver, though, which I think is only found in high-end survey equipment and a handful of very recent and expensive smartphones.

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Which smartphones are those? Is there a list somewhere?

The Xiaomi Mi 8 is a relatively inexpensive flagship-grade device with L5/E5a capability.

better list of actual capability

https://developer.android.com/guide/topics/sensors/gnss

Unfortunately, even though there are already several phones on the market whose hardware supports dual band GPS, the software in most cases doesn't.

see this article for details https://medium.com/@sjbarbeau/dual-frequency-gnss-on-android...

My Mi 8 with the stable Android P build seems to be using both frequencies for satellites "in use" at the same time. The actual benefits of it, I don't know though.

https://i.imgur.com/dIlh5Mj.png

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