Questions about Xiaomi 12X EU

I've had the phone for 8 days now and it works perfectly... battery lasts a long time and in about 35/40 minutes the battery is full again, just great... very good processor, no risk of overheating... price/performance outstanding

There is no difference, as Xiaomi smartphones are always supplied with chargers and as, for example, the UK power connection is used in some countries, the chargers in other countries may have a UK connection, but in the case of the EU, a two-pin charger is supplied that fits into the sockets.

The Xiaomi 12s is not released for global markets, it can only be purchased in China.

I don't use the functions myself, but the sliders for them are available in the settings under SIM. So it should work.

According to the product number it is the 256GB version. :)

Yes, it has LTE Band 20 and even 28.