Cache transfer when switching phone Is the content of the web cache of my phone transferred when I switch from one android phone to another? How about web history and DNS cache?

Thanks
You must first understand what cache data is.

Cache data is CPU specific and instance specific. For the same app, different CPU may create different cache depending on what part of the app is running as a process. Moreover, even the same CPU running at different instances may have different app cache. If you open an app, keep it running in the background, but never open it in foreground, the cache created will be different from the one created if the app has been running in foreground. Moreover, once the app has been closed and its process has been killed, then cache space for that data is allowed to be overwritten by new incoming data. So, cache data is never constant.

Don't even think of transferring cache data, because no one can ever do that, and you don't even need to do it. It does not contain anything that you need to transfer. Cache is created and deleted by the microprocessor. You as a user should stay off from cache data intricacies other than clearing it at times to boost speed of CPU.