secrec As AndroidAuthority writes:
"Google has revealed that the Pixel 9a has the Exynos Modem 5300 rather than the newer Exynos Modem 5400 seen in the Pixel 9 series.
[...]
Previous Pixels with the old modem were criticized for their cellular reception and battery life."
Others write
"The Exynos 5300 modem could be a significant downgrade for the all-new Pixel 9a. Notably, previous Pixels packing this modem—especially the Pixel 6 series—had mediocre cellular reception and terrible battery life on cellular data, with massive user complaints regarding this online."