Assuming you're using cellmapper (by far the most useful & reliable), EE's 4G network is mapped a lot more comprehensively than 3G.
As an example, CM knows the location of all my local sites and has full 4G detail for them. Several are missing from the 3G map, and others are places incorrectly.
The signal quality parameters are also different on 3G vs 4G. -110dBm on 3G is probably unusable, 4G quite the opposite
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