Here is basic questions and answer about 4G/5G CA Combos website and data.
Most of mobile device and modem vendors doesn't tell on their devices technical specification what 4G/5G CA combination device support. Most of vendors only show in their technical specification LTE Category and single band support. Also most of devices have Carrier Policy what limits band / combo support in carrier level. This is why 4G/5G CA Combos website is exist to show real data.
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Everyone can submit to us their devices UE Capability Information message what is most of accurate method see current network supported combos. This message 4G/5G modems will send to network when network request. Also we use other log files from modem. You can find instructions in contribute page.
In 3GPP site have good explanation about Carrier Aggregation.
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