Ah, you can buy phones like that from carriers here, though it's far more usual to rent it on contract from them. Personally, for my past half dozen phones I've bought the hardware from various electronics suppliers, and just rented a SIM from various carriers. Then you're not running an OS with the carrier's bloat on it, and you can use the manufacturer's updates.
Edit: @beniotb carriers do use different frequencies, but that was mostly a problem with 1G and early 2G phones. Later 2G phones could handle most of not all of the frequencies in use in a particular territory, and since about 3G it's not something you need to care about as long as you only expect your phone to work in Europe.