They could, but it would be incredibly complicated. It would require special resources in the network, and the benefit is not nearly as big as you might think. LTE is good for tens to hundreds of megabits per second, 5G even more. Most webpages are not limited by that speed
Wifi is usually even faster, and definitely is not a bottleneck, unless something is wrong (and, in that case most phones will flip over to cellular if the wifi is broken and not usable in some way)
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